Faculty of Physics

Sukurta: 10 September 2013

ff9 Saulėtekio, LT-10222 Vilnius
Tel. 236 6001, fax 236 6003
E-mail:
http://www.ff.vu.lt

Dean – Prof. Habil. Dr. Vytautas Balevičius

STAFF

71 teachers (64 holding research degree), 63 research fellows (46 holding research degree), 70 doctoral students

RESEARCH AREAS

Solid State Physics and Technology
Spectrometric Characterization of Materials and Electronic/Molecular Processes
Laser Physics and Technology

DOCTORAL DISSERTATIONS MAINTAINED IN 2013

J. Adamonis. High Power Nd:YAG Laser For Pumping of OPCPA Systems.

V. Balevičius. Quantum coherence in molecular excitation energy transfer and relaxation.

J. Darginavicius. Three and four wave parametric interactions for ultrashort pulse generation in the ultraviolet, near and mid-infrared spectral range.

D. Dobrovolskas. Study of carrier dynamics in InGaN using spatially-resolved photoliuminescence techniques.

V. Dobrovolskas. Effects of convection and non-equilibrium radiation transfer in stellar stmospheres.

A. Miasojedovas. Control of fluorescence properties of organic optoelectronic materials by molecular aggregate formation.

P. Ščajev. Investigation of wide-band-gap semiconductor photoelectric properties by using optical techniques with temporal and spatial resolution.

CONFERENCES ORGANIZED IN 2013

40th Lithuanian National Physics Conference

Vilnius international workshop Spectroscopic Imaging in Medicine and Biology

Workshop of EU Project Ensuring Stability in Organic Solar Cells- ESTABLIS (FP7 ITN Marie-Curie)

MAIN SCIENTIFIC ACHIEVEMENTS IN 2013

Telecommunications Research Centre:

  • Huawei Authorized Network Academy was opened in May 2013;
  • Mobile Applications for Business Laboratory was opened in May 2013.

Innovations in scientific computing: creation of the method based on the spectral maps of 2D coherent spectra providing possibilities to identify the distinctive character between electronic and vibrational coherences; creation of computer code ‘QSFP’ significantly extends the possibilities of theoretical investigations of processes in exiton aggregates and their absorption spectra.

Monograph: L. Valkūnas, D. Abramavičius, T. Mancal. Molecular Excitation Dynamics and Relaxation. Wiley-VCH, Weinheim, 2013, 449 p.

ASTRONOMICAL OBSERVATORY

29 M. K. Čiurlionio, LT-03100, Vilnius
Tel. 239 8764, fax 239 8767
E-mail:

Head – Prof. Dr. Vladas Vansevičius

STAFF

Professor: Dr. V. Vansevičius (part-time).
Associate professors: Dr. J. Sūdžius, Dr. A. Bridžius (part-time), Dr. A. Kučinskas (part-time), Dr. D. Narbutis (part-time), Dr. R. Stonkutė (part-time), Dr. D. Semionov (part-time).
Senior research fellows: Dr. S. Bartašiūtė, Dr. J. Sperauskas.
Junior research fellows: V. Deveikis, S. Raudeliūnas.
Doctoral students: V. Dobrovolskas, T. Mineikis, P. de Meulenaer.

RESEARCH INTERESTS

Structure and evolution of the galaxies
Stellar populations in the Galaxy
Star clusters
Binary stars
Stellar photospheres

RESEARCH PROJECTS CARRIED OUT IN 2013

Projects Supported by University Budget

Stellar Systems - Chemodynamical Evolution. Dr. V. Vansevičius. 2009–2013.

A photometric analysis of the resolved stellar populations in M33 and Leo A galaxies was performed. A new technique for star cluster metallicity determination was developed and applied for the study of nearby galaxies. A long-term radial velocity monitoring (Coravel-type spectrometer) of a large sample of stars was successfully continued. 3D hydrodynamic simulations and analysis of stellar photospheres in globular clusters 47 Tuc and NGC 6752 were performed.

Main publications:

de Meulenaer, P., Narbutis, D., Mineikis, T., Vansevičius, V., 2013. Deriving physical parameters of unresolved star clusters. I. Age, mass, and extinction degeneracies // Astronomy & Astrophysics. EDP Sciences, vol. 550, id. A20, 10 p.

Kazlauskas, A., Sperauskas, J., Boyle, R.P, 2013. A new spectroscopic binary BD +3702777 in the field of doubtful open cluster DOL-DZIM 5 // New Astronomy. Elsevier B.V, vol. 19, 34–41.

Dobrovolskas, V., Kučinskas, A., Steffen, M., Ludwig, H.G., Prakapavičius, D., Klevas, J., Caffau, E., Bonifacio, P, 2013. Three-dimensional hydrodynamical CO5BOLD model atmospheres of red giant stars. III. Line formation in the atmospheres of giants located close to the base of the red giant branch // Astronomy & Astrophysics. EDP Sciences, Vol. 559, id. A102, 22 p.

National Research Projects

Research Council of Lithuania : A Comprehensive Study of Pulsations, Binarity and Chemistry of Post-AGB Stars. Dr. J. Sperauskas. 2012–2014.

Long-term photometric and radial velocity observations of the post-AGB stars were performed at the Moletai Astronomical Observatory.

Main publications:

Hrivnak, B.J., Lu, W., Sperauskas, J., Van Winckel, H., Bohlender, D., Zacs, L., 2013. Studies of Variability in Proto-planetary Nebulae. II. Light and Velocity Curve Analyses of IRAS 22272+5435 and 22223+4327 // The Astrophysical Journal. IOP Science, Vol. 766, id. 116, 21 pp.

MAIN R&D&I (RESEARCH, DEVELOPMENT AND INNOVATION) PARTNERS

Centre for Physical Sciences and Technology (Lithuania)
National Astronomical Observatory of Japan

OTHER SCIENTIFIC ACTIVITIES

Prof. V. Vansevičius –

  • Chairman of the Committee of Natural and Technical Sciences, Research Council of Lithuania

DEPARTMENT OF GENERAL PHYSICS AND SPECTROSCOPY

9 Saulėtekio, LT-10222 Vilnius
Tel. 236 6040, fax 236 6003
E-mail:

Head - Prof. Habil. Dr. Vytautas Balevičius

STAFF

Professors: Habil. Dr. V. Balevičius, Habil. Dr. L. Kimtys (prof. emeritus), Dr. G. Dikčius, Dr. V. Šablinskas, Dr. V. Gulbinas (part-time).
Associate professors: Dr. V. Aleksa, Dr. A. Gruodis, Dr. A. Maršalka, Dr. F. Kuliešius, Dr. J. Čeponkus, Dr. L. Juodis.
Lecturers: Dr. K. Aidas, Dr. Dr. V. Urbonienė.
Doctoral students: N. Kelminskienė, M. Pučetaitė, S. Tamošaitytė, V. Klimavičius.

RESEARCH INTERESTS

Spectroscopy of atoms, molecules and condensed matter
IR, UV, Raman, NMR investigation of organic compounds of the organized structures in the liquid, solid phases and nano-crystals
Phase transitions and critical phenomena
Molecular interactions, hydrogen bonding, conformational analysis
Matrix isolation FTIR spectroscopy

RESEARCH PROJECTS CARRIED OUT IN 2013

Projects Supported by University Budget

Spectroscopy of Molecular Processes in Biological and Mesoscopic Systems . Prof. V. Balevicius, Prof. V. Sablinskas. 2010–2014.

The temperature and composition effects on the phase transitions, hydrogen bonding with H/D exchange, non-equilibrium phenomenon and relaxation in some of imidazolium-based room temperature ionic liquids (RTILs), namely – the 1-decyl-3-methyl-imidazolium bromide- and chloride ([C10mim][Br] and [C10mim][Cl]) in aqueous (H2O/D2O) solutions have been studied applying FTIR, Raman, 1H, 13C, 35Cl and 81Br NMR spectroscopies. Optical properties of some biologically relevant compounds have been studied by means of molecular modelling using advanced quantum chemical methods.

Main publications:

Klimavicius V., Gdaniec, Z., Kausteklis, J., Aleksa, V., Aidas, K., Balevicius, V., 2013. NMR and Raman Spectroscopy Monitoring of Proton/Deuteron Exchange in Aqueous Solutions of Ionic Liquids Forming Hydrogen Bond: A Role of Anions, Self-Aggregation, and Mesophase Formation. Journal of Physical Chemistry B, vol. 117, 10211–10220.

Arul Murugan, N., Olsen, J.M.H., Kongsted, J., Rinkevicius, Z., Aidas, K., Ågren, H., 2013. Amyloid Fibril Induced Structural and Spectral Modifications in the Thioflavin-T Optical Probe. Journal of Physical Chemistry Letters, vol. 4, 70–77.

Aidas, K., Olsen, J.M.H., Kongsted, J., Ågren, H., 2013. Photoabsorption of Acridine Yellow and Proflavin Bound to Human Serum Albumin Studied by Means of Quantum Mechanics/Molecular Dynamics. Journal of Physical Chemistry B, vol.117, 2069–2080.

Main publications:

Pucetaite, M., Hendrixson, V., Zelvys, A., Jankevicius, F., Ceponkus, J., Sablinskas, V., 2013. Application of Infrared Spectroscopical Imaging in Specular Reflection Mode for Morphological Studies of Urinary Stones. Journal of Molecular Structure, vol.1031, 38–42.

Tamošaitytė, S., Hendrixon, V., Želvys, A., Tyla, R., Kučinskienė, Z.A., Jankevičius, F., Pučetaitė, M., Jablonskienė, V., Šablinskas, V., 2013. Combined studies of chemical composition of urine sediments and kidney stones by means of infrared microspectroscopy. Journal of Biomedical Optics 18(2), 027011.

Pucetaite, M., Tamosaityte, S., Engdahl, A., Ceponkus, J., Sablinskas, V., Uvdal, P., 2014. Microspectroscopic Infrared Specular Reflection Chemical Imaging of Multi-Component Urinary Stones: MIR vs. FIR. Cent. Eur. J. Chem. 12(1) 44–52.

The Faculty of Physics as a partner of STEPS TWO network, made reports for the working groups: one Curricula after Bologna & Lifelong Learning and three Physics Teacher Education & European Dimension at group’s meetings in Patras (Greece), also at the EUPEN 13th General Forum - EGF2011 PREPARING GOOD PHYSICS TEACHERS, Limassol (Cyprus): 28–30 August 2011. The reports by researchers of the Faculty of Physics were presented at the General forum. Prof. G. Dikčius.

National Research Projects

Research Council of Lithuania. Spectral Characterization of Silicon and Germanium Containing Functionalized Organic Cyclic Compounds. Assoc. Prof. V. Aleksa. ( MIP-071/2013) 2013–2015

Ab initio and DFT calculations were carried out for three newly syntesized Si containing organic compounds. The theoretical results were compared with experimental vibrational spectra. Geometrical parameters for all three compounds were found.

European Social Fund Agency. Synthesis and Spectroscopical Characterization of Materials Important for Semiconductor- and Nano-Technologies. Prof. V. Sablinskas (No. VP1-3.1- ŠMM-08-K-01-004/KS-120000-1756). 2012–2014.

D ang G spectral modes of functionalized single walled carbon nanotubes were analyzed. It was found that relative intensity of D mode is realated not only with structural effect of the nanotubes but also with interactions between the nanotibes and surrounding media.

Main publications:

Ceponkus, J., Smilga, A.P., Rumskaite, I., Puodziute, I., Sablinskas, V., 2013. Infrared absorption spectroscopy of functionalized single-walled carbon nanotubes. In: Chemija, 24, 1, 9–19.

Agency for Science, Innovation and Technology. Development of Spectroscopic UV-VIS-NIR Analyzers for Multiparameter Characterization of Dispersive Flows. Prof. V. Sablinskas - contact person from VU (Nr. VP2-1.3-ŪM-02-K-04-063) 2013-2015.

UV-VIS, IR and Raman spectra of thin polimeric films were obtained and analyzed. It was found that IR obsorption spectroscopy in attenuated reflection mode is most suited for studies of organic impurities in the films.

International Research Projects

EU research project in the frame of Integrating Activity on Synchrotron and Free Electron Laser Science (IA-SFS) program : Diagnostic Studies of Kidney Stone Disease by Means of Infrared Spectral Microscopy. Prof. R. Nyholm (Swedish National Laboratory of Synchrotron Radiation, Lund), Prof. V. Šablinskas (Vilnius University), 2013.

Contractual Research

MITA inovation cheque UV-VIS-IR and Raman Measurements of Polimeric Samples. V. Balevičius (Contract Nr. ŪST-(SPR-1306)-1/1).

MAIN R&D&I (RESEARCH, DEVELOPMENT AND INNOVATION) PARTNERS

Institute of Physics, National Center of Physical and Technological Sciences (Lithuania)
Technical Universities of Darmstadt and Dresden (Germany)
Paris Sud 11 University (France)
Institute of Bioorganic Chemistry of Polish Academy of Sciences, Poznan (Poland)
National Institute of Chemistry (Slovenia)
Copenhagen University (Denmark)
Lund University (Sweden)
Kiev University (Ukraine)
Belarus State University (Republic of Belarus).

OTHER SCIENTIFIC ACTIVITIES

Prof. V. Balevičius –

  • member of the international advisory board Horizons in Hydrogen Bond Research;
  • member of the international advisory board Nuclear Magnetic Resonance in Condensed Matter;
  • member of the advisory committee International School-Seminar of Galyna Puchkovska on Spectroscopy of Molecules and Crystals.

Prof. G. Dikčius –

  • national coordinator for the EMSPS scheme (mobility of students of physics);
  • ERASMUS coordinator for physics;
  • member of EUPEN network.

DEPARTMENT OF QUANTUM ELECTRONICS

9 Saulėtekio, LT-10222 Vilnius
Tel. 236 60 50, 236 60 05, fax. 236 60 06
e-mail:

Head - Prof. Habil. Dr. Valdas Sirutkaitis

STAFF

Professors: Habil. Dr. V. Sirutkaitis, Habil. Dr. R. Rotomskis, Habil. Dr. V. Smilgevičius, Dr. R. Gadonas, Dr. G. Streckytė, Dr. A. Dubietis, Dr. G. Valiulis, Habil. Dr. B. Kaulakys (part-time), Habil. Dr. A. Piskarskas (emeritus), Habil. Dr. A. Stabinis (emeritus).
Associate professors: Dr. S. Bagdonas, Dr. A. Matijošius, Dr. O. Balachninaitė, Dr. V. Karenauskaitė, Dr. M. Vengris, Dr. V. Jarutis, Dr. A. Melninkaitis, Dr.V. Pyragaitė, Dr. V. Kudriašov, Dr. A. Čiuplys (part-time).
Lecturers: J. Jurkienė, Dr. R. Butkus (part-time), Dr. G. Tamošauskas (part-time), Dr. D. Paipulas (part-time), Dr. R. Piskarskas.
Chief research fellow : Dr. A. Varanavičius.
Senior research fellows: Dr. E. Gaižauskas, Dr. M. Malinauskas, Dr. R. Grigonis, Dr. R. Butkus, Dr. G. Tamošauskas. Dr. V. Vaičaitis.
Research fellows: Dr. R. Antipenkov (until April 2013), Dr. D. Kaškelytė, Dr. M. Peckus.
Head of the teaching laboratory: A. Čiburys.
Doctoral students: L. Damalakienė, J. Darginavičius (until October, 2013), V. Kulvietis (until October, 2013), A. Savickas, J. Galinis, A. Baškevičius, T. Kudrius, D. Kezys, V. Purlys, D. Majus, E. Gabrytė, V. Voiciuk, T. Stanislauskas, A. Žukauskas, G. Batavičiūtė, A. Alesenkov, M. Matulionytė, L. Mažulė, S. Rėkštytė, K. Redeckas, K. Stankevičiūtė, K. Steponkevičius, K. Michalovas (from October 2013), I. Pipinytė (from October 2013), P. Stanislovaitis (from October 2013).

RESEARCH INTERESTS

Study of interaction of high power ultrashort light pulses with transparent media
Development of effective light frequency convertors and light pulse sources with the duration of few optical cycles and stable carrier-envelope phase
Study of femtosecond light filaments and generation of supercontinuum in transparent dielectrics
Development of new technologies for biomedical and industrial applications based on specific interaction of ultrashort light pulses with matter, enabling high precision material processing and surface and bulk modification
Development of optical methods of biomedical diagnostics and extension af application areas
In vivo and in vitro studies of spectral and photophyisica properties of biologically active molecules and nanostructures aiming at optimisation of therapy and diagnostics
Imaging and spectroscopy of biologic objects
Nonlinear optics of ultrashort pulses
Nonlinear optics of Bessel beams
Damage in bulk materials and coatings induced by femtosecond pulses
Optics characterization including reflection/transmission, scattering as well as absorption and laser-induced optical damage threshold in wide spectral range
Pecularities of ultrafast exciton dynamics at reduced dimension in self-assembled molecular nanostructures and quantum dots
Laser submicro- and nanoscale engineering of functional 3D devices
High intensity ultrashort pulse generation by OPCPA system

RESEARCH PROJECTS CARRIED OUT IN 2013

Projects Supported by University Budget

Study of Fundamental Ultrafast Processes in Laser and Nonlinear Optical Systems. Prof. V. Sirutkaitis. 2013–2017.

A comparative experimental study of spectral broadening and supercontinuum (SC) generation in 3-mm-thick sapphire crystal using 800 nm, 130 fs pulses in low-numeric-aperture focused Gaussian and axicon-generated Bessel beam geometry was realized. The statistical analysis performed at different stages of the spectral broadening revealed that observed shot-to-shot fluctuations of the spectral intensity are associated with four-wave-mixing-induced spectral correlations. In our theoretical and experimental research we investigated parametrical diffraction in optical parametric amplifier pumped by two beams.

Main publications:

Majus, D., Dubietis, A., 2013. Statistical properties of ultrafast supercontinuum generated by femtosecond Gaussian and Bessel beams: a comparative study. Journal of the Optical Society of America B 30, 994–999.

Vengris, M., Larsen, D. S., Valkunas, L., Kodis, G., Herrero, C., Gust, D., Moore, T., Moore, A., van Grondelle, R., 2013. The Journal of Physical Chemistry. B, 117, 11372.

Vaičaitis, V., Jarutis, V., Steponkevicius, K., Stabinis, A., 2013. Noncollinear six-wave mixing of femtosecond laser pulses in air. Physical Review A 87, 063825.

Gaižauskas, E., Trinkūnas, G., 2013. Tracing coherences of quantum states by ultrafast laser spectroscopy. Lith. J. Phys. 53 (1), 1–16.

Development of Laser Technologies for Industrial and Biomedical Applications Prof. R. Gadonas. 2013–2017.

Investigation of mechanisms occuring in three-dimensional direct writing at micro-/nano-scale of polymers employing tighly focussed ultrashort high repetition laser pulses was performed. Trawl of cross-linkable materials suitable to be modified via precisely controlled localized avalanche ionization without additional pohotosensitization was investigated. Combination of thermal extrusion 3D printing with direct laser writing for the creation of artificial polymer scaffolds for applications in stem cell growth and tissue engineering was investigated. Possibilities of combination of different materials in 3D writing of complex structures were studied. The formation of J-aggregates during pseudoisocyanine iodide/PVA thin-film formation by spin-coating method was investigated.

Main publications:

Buividas, R., Rekštytė, S., Malinauskas, M., Juodkazis, S., 2013. Nano-structuring of materials by controlled avalanche using femtosecond laser pulses. Opt. Mat. Express, Vol. 3, No.10, 1674–1686.

Jonušauskas, L., Žukauskas, A., Danilevičius, P., Malinauskas, M., 2013. Fabrication, replication, and characterization of microlenses for optofluidic applications. Proc. SPIE 8613, 861318.

Skripka, A., Valanciunaite, J., Dauderis, G., Poderys, V., Kubiliute, R., Rotomskis, R., 2013. Two-photon excited quantum dots as energy donors for photosensitizer chlorine(6) J. of Biomed.Opt., Vol. 18, Iss. 7, Art.Nr: 078002, DOI10.1117/1.JBO.18.7.078002.

Rotomskis, R., Valanciunaite, J., Skripka, A., Steponkiene, S., Spogis, G., Bagdonas, S., Streckyte, G., 2013. Complexes of functionalized quantum dots and chlorin e(6) in photodynamic therapy. Lith. J. of Phys., Vol. 53, Iss. 1, 57–68.

National Research Projects

Essential Improvement in Group of Most Important Laser Elements by Enhancement of Optical Resistance and Optimization of Polishing and Metal Oxide Mixture Deposition Technologies (EIGULYS ). 2011–2013.

This project is devoted to optimize the whole technological chain of optical element manufacturing for a higher quality. The main activities were focused on monitoring and improving: optical substrates (glasses and crystals): polishing and cleaning technologies; IBS coating deposition technology for mixture layers consisting of metal oxides; characterization and design of multilayer coatings. A group of quality optical laser elements as well as chain of technological processes was thus revised and improved.

Main publications:

Batavičiūtė, G., Pupka, E., Pyragaitė, V., Smalakys, L., Melninkaitis, A., 2013. Effect of longitudinal laser mode beating in damage probability measurements. Proc. SPIE 8885, Laser-Induced Damage in Optical Materials: 88851M; (November 14, 2013); doi:10.1117/12.2030306.

Kičas, S., Batavičiūtė, G., Juškevičius, K., Tolenis, T., Drazdys, R., Buzelis, R., Melninkaitis, A., 2013. Characterization and application of HfO2 - SiO2 mixtures produced by ion-beam sputtering technology. Proc. SPIE 8885, Laser-Induced Damage in Optical Materials, 888521 (November 14, 2013); doi:10.1117/12.2030308.

Juškevičius, K., Buzelis, R., Kičas, S., Tolenis, T., Drazdys, R., Batavičiūtė, G., Pupka, E., Smalakys, L, Melninkaitis, A., 2013. Investigation of subsurface damage impact on resistance of laser radiation of fused silica substrates. Proc. SPIE 8885, Laser-Induced Damage in Optical Materials, 888529 (November 14, 2013); doi:10.1117/12.2030310.

Development and Implementation of Carier-Envelope Phase Control in OPCP Systems (PHASECONTROL). 2011–2013.

Implementation of several CEP locking techniques and their combinations allowed achieving the sub-100 mrad of oscillator CEP jitter and demonstrating the laser system operation with 170 mrad RMS phase noise. Active and passive CEP stabilization for parametric amplifiers has been tested. OPA operation in self-phase-stabilization regime providing CEP jitter as low as 70 mrad over 6 hours has been demonstrated.

Main publications:

Stanislauskas, T., Antipenkov, R., Martinėnaitė, V., Karpavičius, L., Varanavičius, A., Mišeikis, P., Grigaitis, D., Mikalauskas, D., Karkockas, R., Sinkevičius, V., Giniūnas, L., Danielius, R., Balčiūnas, T., Pugžlys, A., Baltuška, A., Schmidt, B., 2013. Carrier-envelope phase control of Yb:KGW laser and parametric amplifiers. Lith. J. Phys, Vol. 53, 17–24.

Development and Research of the Synchronously Pumped Femtosecond Optical Parametric Oscillator (MEGAOPO ). 2012–2013.

Synchronously pumped optical parametric oscillators pumped by the first and second harmonics of femtosecond (~100 fs) Yb:KGW laser have been investigated. Periodically poled lithium niobate, lithium triborate and beta barium borate as nonlinear optical material were used for parametric oscillator. Several experimental layouts were investigated trying to mitigate group velocity mismatch. Optimization of parameters was performed for achieving of high conversion efficiencies.

Main publications:

Stankevičiūtė, K., Pipinytė, I., Stasevičius, I., Vengelis, J., Valiulis, G., Grigonis, R., Vengris, M., Bardauskas, M., Giniūnas, L., Balachninaitė, O., Eckardt, R.C., Sirutkaitis, V., 2013. Femtosecond optical parametric oscilators sinchronously pumped by Yb:KGW oscillator. Lith. J. Phys. 201353, 41–56.

Stankevičiūtė, K., Pipinytė, I., Vengelis, J., Marcinkevičiūtė, A., Šuminas, R., Grigonis, R., Eckardt, R.C., Sirutkaitis, V., 2013. Optical parametric oscillators synchronously pumped by fundamental and second harmonic radiation of femtosecond Yb:KGW laser. Proc. SPIE . 8845, 884519.

Pipinytė, I., Grigonis, R., Stankevičiūtė, K., Kičas, S., Drazdys, R., Eckardt, R.C., Sirutkaitis, V., 2031. Laser-induced-damage threshold of periodically poled lithium niobate for 1030 nm femtosecond laser pulses at 100 kHz and 75 MHz. Proc. SPIE . 8786, 87861N.

Creation of Biologically Active Regular Three-Dimensional Structures for Tissue Molecular Bioengineering (BIO-MATRIX). 2012–2013.

In this project we have developed technique to produce biologically active matrices. Polymer, from which regular 2D structures at the next stage would be formed by two-photon laser-induced polymerization, was chosen. Development of a methodology to precisely decorate regular structure matrices with biologically active ingredients: cell migration regulating molecules, proteins. For this purpose we have produced and optimized the advanced positioning device Machine Vision for the generation of regular structure matrices by laser-induced polymerization, as well as development of new technology of matrix decoration with biologically active molecules. Photo-activated compounds for protein immobilization on the matrix have been developed. Photo-polymerized 2D matrix was treated with our newly developed molecular linker that covalently coupled to the entire matrix, the major innovation here is that other part of the linker is inactive (linker can not link the protein until photo-activation) and has to be laser-induced in order to be able to covalently couple proteins. Our positioning device guided laser to activate linker at the desired location of the matrix. Then the matrix was placed in a biologically active protein solution, which covalently decorated selected locations. Testing took place via protein containing fluorescent tag. It has been shown that photo-induced linker successfully connected to the polymer structure, and antibodies covalently bound to our selected locations of activation. The optimal laser activation parameters were determined. Number of different PDGF gradients have been modeled and formed on the 2D polymer surfaces. We have proved that these molecules attached to the substrate can stimulate cell migration, cell behaviour was observed by time laps laser confocal microscopy. The distribution of cells on 3D structures was studied.

Main publications:

Malinauskas, M., Kiršanskė, G., Rekštytė, S., Jonavičius, T., Kaziulionytė, E., Jonušauskas, L., Žukauskas, A., Gadonas, R., Piskarskas, A., 2012. Nanophotonic lithography: a versatile tool for manufacturing functional three-dimensional micro-/nano-objects. Lith. J. Phys, Vol.52 (4), 312–326.

Fabrication of Micro/Nanooptical Elements by Means of Laser and Electron Beam Lithographies (MIKROŠVIESA). 2012–2014.

The project aims at obtaining knowledge and acquiring skills of modern the direct writing techniques for fabrication of multifunctional micro/nanooptical components as well as their integration in already existent microsystems. The main targeted application fields are telecommunication, microscopy, biology and medicine, production of laser sources, solar cell industry.

The main objective of the project is to develop efficient prototyping of various microoptical and nanooptical components out of novel class hybrid photopolymers by direct writing using femtosecond lasers and electron beam lithography, additionally combining it with nanoimprint lithography (soft lithography replication) technique. Pursuing for this aim it is planned to solve several tasks: develop and optimize laser writing in polymers and their development after exposure, determine and select materials suitable for fabrication and application of microoptical and nanooptical components, assess their quality and characterize their performance, compare experimental results to theoretical estimations.

Main publications:

Zukauskas, A., Malinauskas, M., Brasselet, E., 2013. Monolithic generators of pseudo-nondiffracting optical vortex beams at the microscale. Appl. Phys. Letters, Vol. 103, 181122–181130.

Rekstyte, S., Malinauskas, M., Juodkazis, S., 2013. Three-dimensional laser micro-sculpturing of silicone: towards bio-compatible scaffolds. Opt. Express, Vol. 21(14), 17028–17041.

Formation of Coherent Radiation in Nonlinear Crystals by Incoherent Pump (Kost). 2013–2015.

In this project we investigate the possibility to amplify a coherent signal from the incoherent pump in a nonlinear crystal.

The conditions which have to be fulfilled were noted: the group velocities of the idler and pump waves must coincide and differ from the one of the signal wave. Picozzi with coauthors have shown in their publications that at this condition the narrowband signal can be generated by incoherent pump. Piskarskas and coauthors showed that this feature is feasible not only in the OPA but also in the second harmonic generator. Our theoretical as well as experimental work reveals that incoherent broadband pump can be used for amplification of narrowband coherent signal. We investigated two cases: 1) when the conditions mentioned by Sukhorukov and Picozzi are satisfied; 2) when the dispersion in nonlinear crystal can be neglected. In both cases we numerically demonstrate the amplification and at pump depletion we show that all components of the broadband pump are transferred to narrowband signal. The experiment was performed with distorted laser beams in the nonlinear crystal in which the diffraction and walk-off effects were negligible, so the dispersion can be omitted. The amplification of narrowband input laser beam was demonstrated. The experimental data is in good agreement with the theory.

Main publications:

Pyragaite, V., Stabinis, A., Piskarskas, A., Smilgevičius, V., 2013. Parametric amplification in the field of incoherent light. Phys. Rev. A, Vol. 87, 063809–20.

Pyragaite, V., Smilgevičius, V., Butkus, R., Stabinis, A., Piskarskas, A., 2013. Conversion of broadband incoherent pump to narrowband signal in an optical parametric amplifier. Phys. Rev. A, Vol. 88, 023820–25.

Nonlinear Technologies of THz Photonics: Fundamental Problems and Applications (TAP LB 03/2013).

The theoretical analysis of the difference-frequency generation is given for the three-level quantum system having been forbidden in dipole approximation electronic and optically active (allowed) vibration transitions. Pump and injection laser pulses of short duration compared to the phase relaxation time of electronic and vibrational coherences in the medium were considered. The wavelength of the pump pulse was taken as being in the visible or near infrared spectral regions, while the frequency of the injection pulse was almost twice higher than that of the pump. Efficiency of THz radiation arising during excitation of both the electronic and vibrational coherences at two-photon and combined resonances in the TLQS, respectively, was evaluated.

Complete Characterization of Ultrafast Nonlinear Light-Matter Interactions in Transparent Dielectrics in the Infrared Spectral Range (COLMIR). 2013–2015.

Ultrabroadband, carrier envelope phase-stable supercontinuum accompanied by third harmonic generation by filamentation of two optical-cycle pulses at 2 m in wide-bandgap solids: sapphire, fused silica, CaF2, and YAG, in anomalous group velocity dispersion regime is demonstrated. Periodic spectral modulation of third harmonic reveals a double-peaked temporal structure of the pulse, consisting of free and driven components, which are generated in the regime of large phase and group-velocity mismatch.

Main publications:

Darginavičius, J., Majus, D., Jukna, V., Garejev, N., Valiulis, G., Couairon, A., Dubietis, A., 2013. Ultrabroadband supercontinuum and third-harmonic generation in bulk solids with two optical-cycle carrier-envelope phase-stable pulses at 2 µm. Optics Express, Vol. 21, 25210–25220.

International Research Projects

7FP Project: Integrated European Laser Laboratories III (LASERLAB-Europe III). 2012–2014.

Eight visits of Transnational Access to VULRC using multifunctional laser infrastructure were performed. The visitors were from the following countries: Austria (1), Greece (4), France (4), Spain (1), Estonia (3), United Kingdom (2).

Three Joint Research Activities (JRA) are in action: Innovative radiation sources at the extremes (INREX); European Research Objectives on Laser for Innovation, Technology and Energy (EURO-LITE) and Laser and photonics for biology and health (BIOPTICHAL).

Within the JRA BIOPTICHAL, we continued studies of the mechanisms of irreversible photochemical reactions leading to formation of polymer chains in a number of photosensitive pre-polymer materials. Aiming at development of technology enabling fabrication of biocompatible scaffolds for stem cell growth and tissue engineering, we focused on combination of different technological platforms such as thermal extrusion printing and direct laser writing. Additionally, possibilities of combination of different materials in 3D writing of complex structures were studied. We also worked on search of cross-linkable materials which can be used in laser writing without pohotosensitizers.

Within the JRA INREX, spectroscopic measurements of the coherence relaxation times (CRT) and collisional broadening of D1 (769 nm) and D2 (766 nm) lines of potassium have been carried out. The obtained values of CRT corresponded well with previous experiments, obtained via the absorption-polarization methods. In addition, an enhancement of the axial with the conical components of the doublet emissions has been register and the analysis of their competition was also performed.

Within the JRA EURO-LITE, the flat top ps pulse formalion in cascade SH generators has been studies experimetaly. It was shown that operating DKDP crystal based SH generator at ~50 % energy conversion conditions the ~75 ps Gaussian fundamental pulses can be converted to pulses with hyper-Gaussian profile pulses having intensity plateau region extending over ~ 100 ps time interval. Similar trends in the pulse envelope transformations have been observed when generating SH in the LBO crystal pumped by 56 ps pulses. Another activity in the frame of JRA EURO-LITE was design and building of the test station for the laser-induced damage threshold (LIDT) measurements in vacuum and at cryogenic temperatures. This station was used for LIDT measurements of laser materials and optical coatings in vacuum.

Main publications:

Purlys, V., Maigytė, L., Gailevičius, D., Peckus, M., Malinauskas, M., Staliunas, K., 2013. Spatial filtering by chirped photonic crytals. Physical Rewiew A, Vol. 87, 033805–1.

Gaižauskas, E., Pentaris, D., Efthimiopoulos, T., Vaičaitis, V., 2013.. Probing electronic coherences by combined two- and one-photon excitation in atomic vapors. Optics. Lett. , Vol. 38 (2), 124–126.

Laasner, R., Fedorov, N., Grigonis, R., Guizard, S., Kirm, M., Makhov, V., Markov, S., Nagirnyi, V., Sirutkaitis, V., Vasilev, A., Vielhauer, S., Tupitsyna, I.A., 2013. Band tail absorption saturation in CdWO4 with 100 fs laser pulses. J.Phys.: Condens. Matter, Vol. 25, 245901–12.

Project Establishment of the Multi-Functional Laser Facility (NAGLIS). 2010–2013.

The construction of multi-functional laser facility Naglis is almost completed with final adjustments of air supply and conditioning systems to be completed. The laboratories are being prepared for installation of equipment and special frames and hanging-shelves are being constructed for better vibration and dust protection. By the end of the year some part of equipment will be already brought in and all laboratories will be supplied with the planned devices until the third quarter of 2014.

Research grant No.VP1-3.1-SMM-10-V-02-007, supported by European Social Fund Agency: Development and Utilization of a New Generation Industrial Laser Material Processing Using Ultrashort Pulse Lasers for Industrial Applications.

We demonstrated that black silicon (b-Si) made by dry plasma etching is a promising substrate for laser three-dimensional (3D) micro/nano-polymerization. Direct laser writing (DLW) based on ultra-localized polymerization is an efficient way to produce three-dimensional (3D) micro/nano-structures for diverse applications in science and industry. We showed fabrication of sub-100 nm resolution structures by ablation on the surface of sapphire using femtosecond laser pulses. A single 50-70 nm wide groove was recorded by laser ablation via a controlled ripple formation on the surface.

Main publications:

Zukauskas, A., Malinauskas, M., Kadys, A., Gervinskas, G., Seniutinas, G., Kandasamy, S., Juodkazis, S., 2013. Black silicon: substrate for laser 3D micro/nanopolymerization. Optics Express, Vol. 21(6), 6901–6906.

Buividas, R., Rekstyte, S., Malinauskas, M., Juodkazis, S., 2013. Nano-groove and 3D fabrication by controlled avalanche using femtosecond laser pulses. Optical Materials Express, Vol. 3(10), DOI:10.1364/OME.3.001674.

Mikutis, M., Kudrius, T., Slekys, G., Paipulas, D., Juodkazis, S., 2013. High 90% efficiency Bragg gratings formed in fused silica by femtosecond Gauss-Bessel laser beams. Optical Materials Express, Vol. 3(11), DOI:10.1364/OME.3.001862.

MAIN R&D&I (RESEARCH, DEVELOPMENT AND INNOVATION) PARTNERS

Svinburne University of Technology, Centre for Micro-Photonics (H34) (Australia)
UPC (Universitat PolitĆØcnica de Catalunya), Departament de Fisica i Enginyeria Nuclear (Spain)
University of Patras, Physics Department, Laser, Nonlinear and Quantum Optics Labs (Greece)
Institut Fresnel-CNRS UMR 7249-Equipe ILM, Escole Centrale Marseille-Aix Marseille Universite (France)
CNISM and Dipartimento di Scienza e Alta Tecnologia, University of Insubria (Italy)

OTHER SCIENTIFIC ACTIVITIES

Prof. V. Sirutkaitis –

  • member of Access Board of Laserlab-Europe 3;
  • council member on High Technology programme at the Agency for Science, Innovation and Technology (MITA, Lithuania);
  • member of SPIE.

Prof. R. Rotomskis –

  • member of the Scientific Advisory Committee of the International Forum for Virtual Conferences Internet Photochemistry and Photobiology;
  • member of the Council of the European Society for Photobiology, Executive Representative of Photobiology Sciences for East European countries;
  • National representative of the Mirror Group of ETP Nanomedicine.

Prof. A. Dubietis –

  • member of the Optical Society of America;
  • member of the International Meteor Organization.

DEPARTMENT OF RADIOPHYSICS

9 Saulėtekio, LT - 10222 Vilnius,
Tel. 236 6080, fax 236 6081
E-mail

Head - Prof. Habil. Dr. Jonas Matukas

STAFF

Professors: Habil. Dr J. Banys, Habil. Dr. J. Matukas, Habil. Dr. V. Ivaška, Habil. Dr. A. F. Orliukas, Habil. Dr. D. Čiplys.
Associate professors: Dr. V. Kalesinskas, Dr. V. Samulionis, Dr. A. Kežionis, Dr. V. Jonkus, Dr. R. Rimeika, Dr. V. Kunigėlis, Dr. M. Žilinskas, Dr. R. Sobiestijanskas, Dr. S. Pralgauskaitė, Dr. R. Grigalaitis, Dr. E. Kazakevičius, Dr. K. Svirskas.
Lecturers : Dr. R. Aleksiejūnas, Dr. T. Šalkus, Dr. Č. Pavasaris, Dr. R. Giriūnienė, E. Palaimienė, M. Ivanov, S. Kazlauskas.
Research fellows: Dr. J. Vyšniauskas, Dr. S. Lapinskas, Dr. A. Lisauskas, Dr. V. Kalendra, Dr. V. Žalkauskas, Dr. A. Bernotas, Dr. A. Brilingas
Engineering staff: A. Sereika, V. Adomaitis, Dž. Jablonskas.
Doctoral students: Š. Bagdzevičius, M. Ivanov, E. Palaimienė, V. Venckutė, S. Kazlauskas, R. Mackevičiūtė, J. Aleksandravičius, J. Zdanevičius, J. Belovickis, J. Krivochiža.

RESEARCH INTERESTS

Laboratory of Physical Acoustics:
Propagation and interaction of acoustic waves in condensed matter

RESEARCH PROJECTS CARRIED OUT IN 2013

Projects Supported by University Budget

Department of Radiophysics, Laboratory of Solid State Ionics

The Investigation of Technology Conditions of the Preparation and Physical Properties of Some Superionic Ceramics with Fast Oxygen Vacancy and Li Ions Transport. Prof. Habil Dr. A. F. Orliukas. 2011–2015.

The preparation of conditions of Li+ and oxygen vacancy was conducted, solid electrolyte ceramics and investigation of the relationship between technological conditions of the preparation of the ceramics and their electrical properties in the frequency range from 1 Hz to 3 GHz in the temperature interval (300–1000) K were performed.

Main publications:

Kazlauskas, S., Kezionis, A., Salkus, T., Orliukas, A.F., 2013.. Electrical properties of YSZ and CaSZ single crystals. Solid State Ionics, 231, 37–42.

Orliukas, A.F., Kežionis, A., Kazakevičius, E., Šalkus, T., Kayla, M.I., Kranjčec, M., Studenyak, I.P., 2013. Electrical conductivity of superionic composites based on Cu6P1−xAsxS5I solid solutions. Solid State Ionics, 251, 83–86.

Kezionis, A., Butvilas, P., Salkus, T., Kazlauskas, S., Petrulionis, D., Zukauskas, T., Kazakevicius, E., Orliukas, A.F., 2013. Four-electrode impedance spectrometer for investigation of solid ion conductors. Review of Scientific Instruments, 84, 013902.

Noise Characteristics Investigation of Quantum Structure Devices Employed in Telecommunication Systems. Prof. J. Matukas. 2010–2015.

Investigation of low frequency noise and responsivity characteristics of CMOS transistor-based detectors for terahertz radiation has been carried out. The main noise origins are thermal channel noise and generation-recombination, also 1/f-type fluctuations.

Influence of aging processes to the high-power light emitting diodes noise and operation characteristics have been investigated. Degradation of different parts of device: active region, phosphors layer, secondary optics has been evaluated.

Main publications:

Palenskis, V., Matukas, J., Pralgauskaitė, S., Seliuta, D., Kašalynas, I., Subačius, L., Valušis, G., Khanna, S. P., 2013. Linfield Edmund H. Low-frequency noise properties of beryllium Ī´-doped GaAs/AlAs quantum wells near the Mott transition. Journal of Applied Physics. Melville: American Institute of Physics, Vol. 113, No. 8, p. Art. No. 083707 (1–7).

Lisauskas, A., Boppel, S., Matukas, J., Palenskis, V., Minkevičius, L., Valušis, G., Bolivar P.H., Roskos, H.G., 2013. Terahertz responsivity and low-frequency noise in biased silicon field-effect transistors. Applied physics letters. Melville: American Institute of Physics, Vol. 102, iss. 15, Art. No. 153505 (1–4).

Acoustic Investigations of Complex Structures. Prof. D. Čiplys. 2013–2017.

The modeling of pulse acoustic spectroscopy of the non-homogenous structures was performed. Peculiarities of the surface acoustic wave propagation in rotated-cut lithium tantalate crystals were investigated. Possibilities of application of layered-structures for acoustic sensors were studied .

Chromatographic and Electromigrative Techniques: Development and Application of New Preconcentration and Separation Systems.

National Research Projects

Complex Investigations of Multifferroic Properties in Composites and Nanoceramics (No VP1-3.1-ŠMM-07-K). Dr. R. Grigalaitis. 2013–2015.

This project investigates electrical, elastic and magnetic properties of multifunctional ferroic materials - multiferroics and nanoferroics, improvement of their functionality and revealing of the perspectives for practical applications. During the project the multiferroic composites are investigated by dielectric, ultrasonic and Mössbauer spectroscopies, the measurements of ferroelectric hysteresis loops will be performed. The obtained results will be used for the theoretical modelling of their dielectric properties by modified known methods.

Dielectric and Ultrasonic Investigations of Composites of Inorganic Nanotubes and Polymers (No MIP-068/2012). Prof. J. Banys 2012–2014.

The discovery of carbon nanotubes (CNTs) and other new forms of carbon opened a dynamic new field in physics, chemistry, and materials science. The main objective of the project is to investigate new composite materials from inorganic nanotubes and polymers and to establish appropriate links and transfer of knowledge needed for application of this kind of composite media by industry. Very interesting nanotube and nanowire forming materials are transition metal/chalcogen/halogenides (TMCH). The properties of TMCH and other inorganic nanotubes in composites with polymers are practically unexplored. During this project we investigate these materials and compare with CNT materials.

Main publications:

Svirskas, Š., Jablonskas, D., Samulionis, V., Kupreviciute, A., Banys, J., Seow Jecg Chin, McNally, T., 2013. Effect of Mo6S3I 6 nanowires on the dielectric properties of poly(e-caprolactone). Phys. Status Solidi A, 1–6 / DOI 10.1002/pssa.201329313.

Samulionis, V., Svirskas, Š., Banys, J., Sánchez-Ferrer, A., Seow Jecg Chin, McNally, T., 2013. Ultrasonic properties of composites of polymers and inorganic nanoparticles. Phys. Status Solidi A, 1–5 / DOI 10.1002/pssa.201329294.

Urvakis, M., Kupreviciute, A., Banys, J., Macutkevic, J., Mayoral B., McNally, T., 2012. Effect of annealing and biaxial deformation on the dielectric properties of composites of multiwall carbon nanotubes and poly(ethylene terephthalate). Journal of Nanophotonics, Vol. 6, 061708.

Research Council of Lithuania. Taiwan-Latvia-Lithuania cooperation project. Materials and Processing Development for Advanced Li ion Batteries (No TAP-LLT-03/2012). Prof. Habil. Dr. A. F. Orliukas. 2012–2014.

Preparation and characterization of Li4Ti5-xAxO12 (x =0, 0.05, A = Nb, Ta) ceramics. We have investigated Li4Ti5O12, Li4Ti5-xAxO12 (where A=Nb, Ta, x = 0.05), LiFePO4 , LiFePO 4/C , LiFeP2O7 and Li0.9Fe0.9Ti0.1P2O7 ceramics. The results of the X-ray diffraction (XRD) study, SEM/EDX, X-ray photoelectron spectroscopy (XPS) of the surface of the ceramics and results of investigation of electrical properties of the compounds in the frequency range (10 – 3x109 ) Hz in the temperature range (300-780) K by impedance spectroscopy are presented in the paper.

Main publications:

Orliukas, A. F., Fung, K.-Z., Bajars, G., Venckutė, V., Kežionis, A., Šalkus, T., Kazakevičius, E., Kazlauskienė, V., Miškinis, J., Maneikis , A., Lelis, M. Preparation and characterization of Li4Ti5-xAxO12 (x =0, 0.05, A = Nb, Ta) ceramics, Superionic Materials for Advanced Applications. Program and Book of Abstracts, 20–23 October 2013, Vilnius, p. 18.

Orliukas, A.F., Fung, K.-Z., Venckutė, V., Kazlauskienė, V., Miškinis, J., Dindune, A., Kanepe, Z., Ronis, J., Maneikis, A., Šalkus, T., Kežionis, A. SEM/EDX, XPS and impedance spectroscopy of LiFePO4 and LiFePO4/C ceramics. 19th international conference on solid state ionics, book of abstracts, June 2–7, 2013, Japan. Kyoto, 2013.

Venckutė, V., Miškinis, J., Kazlauskienė, V., Šalkus, T., Dindune, A., Kanepe, Z., Ronis, J., Maneikis, A., Lelis, M., Kežionis, A.,, Orliukas, A.F. XRD, XPS, SEM/EDX and broadband impedance spectroscopy study of pyrophosphate (LiFeP2O7 and Li0.9Fe0.9Ti 0.1P2O7) ceramics. 40th national conference of physisists: program and proceedings, Vilnius, June 10–12, 2013. Vilnius: Vilniaus universiteto leidykla, 2013, p. 65.

Reserch Council of Lithuania Broadband Spectroscopy of Carbon Nanostructures and Ferroelectric Relaxors (VP 1-3.1-ŠMM-07-K-02-041/LSS-120000-2259). Dr. J. Macutkevič 2012–2015.

The dielectric properties of composites filled with various nanocarbons inclusions were investigated in very wide frequency range from Hertz to Terahertz. Electrical percolation started earlier for single walled carbon nanotubes composites (less than 0.25 wt. % concentration in epoxy resin matrix). However, percolation in exfoliated graphite composites at 1.5 wt. % was very sharp and electrical conductivity of 2 wt. % exfoliated graphite epoxy was two orders of magnitude higher than corresponding values for single walled carbon nanotubes composites. The absolute values of the permittivity as well as the conductivity for composites loaded with high surface area carbon black and multi walled carbon nanotubes were very close, which means that, taking into account the observed good mechanical and thermal properties of high surface carbon black epoxy composites, carbon black high surface area could easily compete with commercial multi walled carbon nanotubes in different electrical and electromagnetic applications. The highest percolation threshold was observed in onion-like carbon based composites; however above percolation threshold the value of complex microwave dielectric permittivity is higher in comparison with carbon nanotubes and carbon black composites.

Main publications:

Macutkevic, J., Kuzhir, P., Paddubskaya, A., Banys, J., Maksimenko, S., Stefanutti, E., Micciulla, F., Bellucci, S., 2013. Broadband dielectric/electric properties of epoxy thin films filled with multiwalled carbon nanotubes. Journal of Nanophotonics 7, 073593 (1–14).

Macutkevic, J., Kuzhir, P., Paddubskaya, A., Maksimenko, S., Banys, J., Celzard, A., Fierro, V., Bistarelli, S., Cataldo, A., Micciulla, F., Bellucci, S., 2013. Electrical transport in carbon black-epoxy resin composites at different temperatures. Journal of Applied Physics 114, 033707.

Kuzhir, P., Paddubskaya, A., Plyushch, A., Volynets, N., Maksimenko, S., Macutkevic, J., Kranauskaite, I., Banys, J., Ivanov, E., Kotsilkova, R., Celzard, A., Fierro, V., Zicans, J., Ivanova, T., Merijs Meri, R., Bochkov, I., Cataldo, A., Micciulla, F., Bellucci, S., Lambin, Ph., 2013. Epoxy composites filled with high surface area-carbon fillers: optimization of electromagnetic shielding, electrical, mechanical, and thermal properties. Journal of Applied Physics 114, 164304.

Research Council of Lithuania. Technological Processes of Membranes Production for Micro- Solid Oxide Fuel Cells (No. ATE-09/2012). Project coordinator Prof. S. Tamulevičius (Kaunas University of Technology). Vilnius University Faculty of Physics group leader Dr. T. Šalkus 2012–2014.

The project aims at researching the technological processes development of multilayered membrane structures for micro solid oxide fuel cells. New solid electrolytes and thin layer structures are analyzed in a wide range of temperatures and frequencies by impedance spectroscopy. The project brings together four teams with complementing experiences in the field of applications for future energy. Threelayered membrane structures including electrolyte, positive and negative electrodes are going to be produced.

Main publications:

Kazlauskas, S., Kežionis, A., Šalkus, T., Orliukas, A.F., 2012. Sintering of oxygen ion conductive ceramics and their electrical properties. Lithuanian Journal of Physics, Vol. 52, No. 3, 231–237.

Šalkus, T., Steins, I., Barre, M., Kežionis, A., Orliukas, A.F., 2013. Preparation of superionic ceramics by spark plasma method. Materials Science (Medžiagotyra), Vol. 19, No. 3, 250–253.

Research Council of Lithuania. Agency for Science, Innovation and Technology. Creation of Physical Access Control Service System . Doc. V. Jonkus. 2011–2013.

This project was prepared for the Information technology part of the high-tech development program for the years 2011-2013, continuing the high-tech development program for the years 2007–2013. Project main objectives are: to develop a multi-service PACS; to evaluate and select the authentication methods that would ensure the most efficient user authentication; to develop typical pairs of the authentication methods, which could be implemented in different security area, depending on area security level; to investigate theoretical applications and determine their physical adaptability, also determine PACS physical adaptability with other security systems; to simulate and build PACS prototype; to optimize the obtained results; to identify the product efficiency; to identify the product compliance with physical access requirements of international standards.

Operational programme for human resources development for 2001 –2013 Priority 3 Strengthening Capacities of Researchers VP1-3.1-ŠMM-07-K Support to Research Activities of Scientists and Other Researcher (Global Grant): Rectification by plasma waves in 2D electron gas and its application for terahertz detection (Nr. VP1-3.1-ŠMM-07-K-03-040). Prof. A. Lisauskas. 2013–2015.

Low frequency noise and responsivity characteristic of CMOS field-effect transistors (that will be used as detectors for fabrication of terahertz camera) investigation has been carried out.

Research project funded from the European Community’s Social Foundation (Grant Agreement No. VP1-3.1-ŠMM-08-K-01-004/KS-120000-1756): Synthesis and Characterization of New Materials for Semiconductor- and Nano-Technologies by Means of Continuous and Ultrafast Spectroscopic Methods. V. Šablinskas. 2012 –2015.

Low frequency noise characteristic investigation of CoFe2O4-BaTiO3 and BaTiO3-NiFe2O4 ceramic composites has been carried out and physical processes during the phase transition were cleared up.

Low frequency noise characteristics of modern optoelectronic devices (light emitting and laser diodes) have been investigated.

Main publications:

Palenskis, V., Matukas, J., Vyšniauskas, J., Pralgauskaitė, S., Shtrikman, H., Seliuta, D., Kašalynas, I., Valušis, G., 2013. Analysis of noise characteristics of GaAs tunnel diodes. Fluctuation and Noise Letters. Singapore : World Scientific Publishing Co. Pte. Ltd., Vol. 12, No. 3, Art. No. 1350014 (14 p.).

Pralgauskaitė, S., Palenskis, V., Matukas, J., Seliuta, D., Kašalynas, I., Valušis, G. White noise peculiarities in diode structures // ICNF 2013: 22nd international conference on noise and fluctuations, Montpellier, France, June 24–28, 2013. IEEE, 2013, [4 p.].

Ragauskas, M., Palenskis, V., Matukas, J., Pralgauskaitė, S., Minkevičius, L., Kašalynas, I., Seliuta, D., Valušis, G. Low frequency noise characteristics of InGaAs bow-tie diodes for terahertz detection // ICNF 2013: 22nd international conference on noise and fluctuations, Montpellier, France, June 24–28, 2013. IEEE, 2013, [4 p.].

Agency for Science, Innovation and Technology (MITA) program VP2-1.3-ŪM-05-K Innovation vouchers: Noise diagnostics of femtosecond laser systems. J. Matukas. 2013.

Noise characteristic features of femtosecond lasers and their systems have been evaluated. The investigation enabled to clear up noise origins and to improve operation characteristics of laser system (supply unit).

Research Council of Lithuania. Characterization of Liquids by Leaky Surface Acoustic Waves (No. PRO-01/2012). Prof. D. Čiplys. 2012–2013.

A new acoustic-wave based technique for liquids characterisation has been proposed. The leaky wave propagating on a lithium tantalate crystal surface radiates a narrow bulk-wave beam, the reflection of which at the crystal-liquid interface strongly depends on the liquid properties. The dependencies of transmitted acoustic wave amplitude and phase on the liquid conductivity have been investigated and applied for discrimination of various brands of natural mineral water.

Main publications:

Rimeika, R., Belovickis, J., Čiplys, D., 2013. Leaky-surface-wave generated acoustic beam displacement upon reflection in lithium tantalate crystals. Applied Physics Letters, Vol. 102, No. 3, art. No. 031601 (1–4).

Čiplys, D., Rimeika, R., 2013. Characterization of liquids using leaky surface acoustic waves in YX-LiTaO3. Proc. Joint UFFC, EFTF and PFM Symposium. Prague, Czech Republic, [CD] paper No. 115.

International Research Projects

Swiss-Lithuanian Ferroelectrics: From Controlled Internal Fields to Energy Harvesting / Medical Diagnostics / Microelectronic Applications (No. CH-3-ŠMM-01/02) Prof. J. Banys. 2012–2016.

Ferroelectrics are ubiquitous materials in modern technology with substantial interest in further extending their functionality in components of medical-diagnostic equipment, microelectronics, energy harvesting, etc. Real ferroelectric materials have internal electric fields due to finite size, charged defects, and inhomogeneities in the material. These fields are often considered a hurdle, typically causing degradation of properties. Several recent studies showed strongly enhanced various properties originating from internal fields, hinting that internal fields could be beneficial if properly addressed. This project aims at better understanding of internal fields in ferroelectrics and using them to obtain enhanced functionality.

Seventh Framework Programme of the European Union, SP3-People, Support for training and career development of researchers (Marie Curie), FP7 People-2009-IRSES, Grant Agreement No. 247579, NANOLICOM (Nanostructured Lithium Conducting Materials). Prof. Habil. Dr. A. F. Orliukas. 2011–2014.

Elemental compositions and binding energies of Ti 2p, P 2p, O 1s and Li 1s core level of NASICON type compounds Li1+4xTi2-x(PO4)3 (where x=0.2, 05), and pyrophosphates LiFeP2O7 and Li0.9Fe0.9Ti0.1P 2O7 ceramics’ have been determined by EDX and XPS. Impedance spectroscopy of the ceramics has been performed in the frequency range 10 Hz – 1 MHz by four electrodes method and in frequency range 1 MHz – 3 GHz by microwave impedance spectrometer. The measurements of the electrical properties of the ceramics were carried out in the temperature interval (300–700) K.

Main publications:

Venckutė, V., Lelis, M., Dindune, A., Kazlauskienė, V., Maneikis, A., Kanepe, Z., Ronis, J., Miškinis, J., Šalkus, T., Kežionis, A., Orliukas, A.F. Anomalous behavior of structural and electrical properties of LiFeP2O7 and Li0.9Fe0.9Ti0.1P 2O7 pyrophosphates. Superionic Materials for Advanced Applications, Program and Book of Abstracts, 20–23 October 2013 Vilnius, p. 20.

Orliukas, A. F., Venckutė, V., Miškinis, J., Kazlauskienė, V., Petrulionis, D., Šalkus, T., Dindune, A., Kanepe, Z., Ronis, J., Žukauskas, T., Maneikis, A., Kežionis, A., 2013. X-ray photoelectron and broadband impedance spectroscopy of Li1+4xTi2-x(PO4)3 (where x = 0.2, 0.5) solid electrolyte ceramics. Lithuanian Journal of Physics, Vilnius: Lietuvos mokslų akademijos leidykla, Vol. 53, No. 4, 244–254.

Research Council of Lithuania. Lithuanian–Belarus Partnership Programme for Bilateral Cooperation in the Field of Science and Technologies. Experimental and Theoretical Study of Bulk and Grain Boundary Ionic Transport in Ceramic Lithium and Oxygen Conductors and the Possibilities to Increase Their Conductivity (No. TAP LB 04/2013). Dr. T. Šalkus 2013–2014.

Lithium and oxygen conducting solid electrolytes are being investigated by impedance spectroscopy in the wide frequency range (up to 3 GHz) at different temperatures. The obtained results are used to support theoretical models which describe microscopic processes taking part in the bulk of ceramic grains and their grain boundaries. Deeper understanding of the ionic transport phenomenon could lead to the improvement of ionic conductivity of the studied materials.

Research Council of Lithuania. Lithuanian–French Programme “Gilibert” for Bilateral Cooperation in the Fields of Culture, Education, Science, Technology and Technique. Synthesis and Characterization of Crystalline and Glassy Lithium Conducting Solid Electrolytes (No. TAP LZ 05/2013). Dr. T. Šalkus 2013–2014.

Lithium ionic conductors Li0.3La0.57TiO3 and Li1.3Al0.3Ti1.7(PO4)3 will be synthesized in the form of glass and crystalline powders. The objective is to mix glassy phase with the crystalline in order to increase grain boundary conductivity of the obtained composite. The main characterization technique is considered to be impedance spectroscopy, which allows one to separate conductivities of different phases of the composites.

MAIN R&D&I (RESEARCH, DEVELOPMENT AND INNOVATION) PARTNERS

Oslo University (Norway)
McMaster University (Canada)
Bookham Technologies (UK)
KTH Royal Institute of Technology (Sweeden)
Leipzig University (Germany)
Latvia University (Latvia)
Warsaw University of Technology (Poland)
Uzhgorod National University (Ukraine)
Du Maine University (France)
Rensselaer Polytechnic Institute (USA)
Oksford University (UK)
Tsukuba University (Japan)
Swiss Federal Institute of Technology (Switzerland)

OTHER SCIENTIFIC ACTIVITIES

Prof. D. Čiplys –

  • Chair of the organising committee for the international 12th School on Acousto-optics and Applications, www.acousto-optics2014.com.

DEPARTMENT OF SEMICONDUCTOR PHYSICS

9 Saulėtekio, LT-10222 Vilnius
Tel. 236 6070, fax 236 6070
E-mail

Head – Prof. Habil. Dr. Gintautas Tamulaitis

STAFF

Professors: Habil. Dr. K. Jarašiūnas (part-time), Habil. Dr. S. Juršėnas (part-time), Habil. Dr. Ž. Kancleris (part-time), Habil. Dr. V. Kažukauskas (part-time), Habil. Dr. E. Kuokštis, Habil. Dr. L. Subačius (part-time), Dr. V. Tamošiūnas, Habil. Dr. G. Tamulaitis (part-time), Acad. Habil. Dr. J. V. Vaitkus (part-time), Dr. G. Valušis (part-time), Acad. Habil. Dr. A. Žukauskas (part-time).
Associate professors: Dr. R. Aleksiejūnas (part-time), Dr. R. Butkutė (part-time), Habil. Dr. V. Gavriušinas (part-time), Dr. I. Šimkienė (part-time), Dr. S. Tamošiūnas (part-time), Dr. E. Žąsinas (part-time).
Lecturers: Dr. I. Kašalynas (part-time), Dr. A. Mekys (part-time), A. Arlauskas (part-time), L. Minkevičius (part-time).
Research fellows: Dr. J. Storasta (part-time), Dr. V. Kalendra (part-time), Dr. J. Mickevičius, Dr. R. Pūras.
Doctoral students: D. Dobrovolskas, M. Černauskas, K. Gulbinas, E. Jelmakas, J. Jurkevičius, D. Maželis, D. Meškauskas, A. Miasojedovas, J. Pavlov, A. Petrulis, S. Raišys, I. Reklaitis, V. Rumbauskas, P. Sčajev, T. Serevičius, M. Skapas, L. Skardžiūtė, D. Ševčenko, A. Tekorius, A. Tuzikas, A. Zabiliūtė.

RESEARCH INTERESTS

Spectroscopic characterization of novel inorganic and organic semiconductor materials for optoelectronics
Optical nonlinearities in semiconductors
III-nitride semiconductors and their technology
Dynamics of nonequilibrium carriers and excitons in highly excited semiconductors and their low-dimensional structures
Radiation detectors, high-density scintillation crystals
Applications of light emitting diodes
Computer simulation of crystal surface and defects

RESEARCH PROJECTS CARRIED OUT IN 2013

Projects Supported by University Budget

Development of Materials, Structures and Devices for Topical Semiconductor Optoelectronics. Prof. K. Jarašiūnas, Prof. S. Juršėnas, Dr. R. Tomašiūnas. 2011–2014.

MOCVD technology for growth of nitrides, their multilayers and nanostructures was built up. GaN, InGaN, AlGaN layers were investigated by scanning electron (EDS, EBIC) and atomic force microscopy, optical (spectroscopy, luminescence, non-linear optical properties) and electrical (mobility) investigation. Orientational properties of materials with noncentrosymmetry (dendrimers, phenylcarbazoles) were investigated. Layered TlGaSe2, InSe and GaSe crystals and 3C-SiC structures were investigated by means of conventional and transient free-carrier absorption spectroscopy, photoacoustic deflection method.

National Research Projects

The Research Council of Lithuania. Enhancement of Light Emisssion Efficiency in Wide-Band-Gap Nitride Semiconductors (No. MIP-054/2012). Dr. J. Mickevičius. 2012–2014.

The Research Council of Lithuania. Design and Investigation of Solid State Lighting Based Solar Simulator of a Class Spectrum (No. MIP-099/2012). Prof. V. Tamošiūnas. 2012–2014.

International Research Projects

Tempus program project Development of Training Network for Improving Education in Energy Saving (No. 530379-TEMPUS-1-2012-1-LV-TEMPUS-JP).Prof. V. Tamošiūnas. 2012–2014.

The main aim of the program is modernization of academic programs related to the topics of energy efficiency. Riga Technical University is the Coordinator of this project.

During 2013, the staff of Vilnius University was coordinating the preparation of the English version of the on-line textbook for the Solar Energy and Photovoltaics course and prepared five chapters for it. In addition, two chapters for the Effective lighting course were prepared. The English versions of these textbooks will later serve as a source of information for the development of the courses in national languages by the project partners.

MAIN R&D&I (RESEARCH, DEVELOPMENT AND INNOVATION) PARTNERS

Centre for Physical Sciences and Technology (Lithuania)
Rensselaer Polytechnic Institute, Troy, NY (USA)
Sensor Electronic Technology, Inc., Columbia, SC (USA)
National Taiwan University, Taipei (Taiwan)
Interuniversity Microelectronic Centre IMEC (Belgium)

OTHER SCIENTIFIC ACTIVITIES

Prof. E. Kuokštis –

Prof. J. V. Vaitkus –

Prof. A. Žukauskas –

DEPARTMENT OF SOLID STATE ELECTRONICS

9 Saulėtekio, LT-10222 Vilnius
Tel. +370 5 2366045, fax +370 5 2366003
E-mail:

Head - Prof. Dr. (HP) Kęstutis Arlauskas

STAFF

Professors: Habil. Dr. G. Juška, Habil. Dr. P.J.Žilinskas.
Associate professors: Dr. M. Viliūnas, Dr. A.Poškus, Dr. A. Pažėra, Dr. V. Jankauskas (part time), Dr. R. Maldžius (part time).
Research fellows: Habil. Dr. T. Lozovski, Habil. Dr. V. Gaidelis, Dr. K. Genevičius, Dr. N. Nekrašas, Dr. G. Sliaužys, Dr. R. Purlys, Dr. R. Rinkunas, Dr. V. Jankauskas (part time), Dr. R. Maldžius (part time).
Doctoral students: V. Sabonis, B. Lenkevičiūtė, R. Dobužinskas, J. Važgėla.

RESEARCH INTERESTS

New functional materials and structures

RESEARCH PROJECTS CARRIED OUT IN 2013

Projects Supported by University Budget

Study and Search for Application of Charge Carriers Dynamics in Disorderly Structure Materials. Prof. K. Arlauskas. 2013–2017.

The aims: theoretically and experimentally investigate current transients of organic field effect transistors (FET) for evaluation of differencies of charge carrier mobilities along and across of channel of FET and, also, evaluate the differencies of charge carrier mobility magnitudes estimated using classical stationary current and current transient measurements.

Numerical modeling of distribution of charge carrier density and electric field in metal-dielectric-semicoductor structures.

Experimental investigation of TiO2 and ZnO morphology influence to charge carrier transport and recombination in organic solar cells.

Search for deposition technologies of multilayered organic-inorganic layers and structures, and investigation of their characteristics.

Search for technology of CVD deposition and doping of dielectric a-SiNx:H layers.

Investigation of charge deposition, distribution and depletion onto low conductivity surface. Theoretical modeling of electric field kinetics during formation of two-dimensional image of toner.

Experimental investigation of electric and dielectric parameters of newly synthesized organic material solvents to prognose their optimal features for e-deposition and evaluation of deposition possibilties and investigation of deposited layers.

Influence of induced by X-rays vacancies and by others perturabtions to standart mean quadratic deviations of Si lattice.

Main publications:

K. Arlauskas, R. Dobuzinskas, J. Varpucianskis, G. Juska Jr., V. Getautis and A. Poskus. Impact of X-ray on Electric Features of Organic and Organic-Inorganic Materials. 16th Canadian Semiconductor Science and Technology Conference, Thunder Bay, Canada, August 13–16, 2013, invited.

T. Grigaitis, K. Arlauskas. Optical and Electrical Properties of Doped Variable Band Gap SiNx:H. 21th International Conference on Materials and Technology, Portorož, Slovenia, November 13–15, 2013.

T. Grigaitis, K. Arlauskas. Optical, Electrical and Morphological Properties of Silicon Nitride (SiNx:H) Grown on Different Surfaces. E-MRS 2013 SPRING MEETING, Strasbourg, France, May 27–31, 2013.

Patent (Lithuania)

R. Purlys, A.J. Janavičius ir S. Balakauskas. p-n sandūros formavimas silicyje naudojant rentgeno spinduliuote generuotą superdifuziją (Formation of p-n junction in Si using X-ray induced superdiffusion). Department of Solid State Electronics, VU Nr. 24, VU, 2013.

National Research Projects

Influence of Nano-Morphology on Charge Carrier Dynamics (VP1-3.1-MES-07-K-01-023)

This project focuses on charge carriers transport and related phenomena (efficiency of photo-generation, mobility of the charge carriers, recombination, trapping and etc.) in nanostructured organic materials for improving performance of Solar cells and field effect transistors. For research bulk heterojunctions made by different technologies were used.

Main publications:

Armin, A., Juška, G., Philippa, B.W., Burn, P.L., Meredith, P., White, R.D., Pivrikas, A. 2013. Doping-Induced Screening of the Built-in-Field in Organic Solar Cells: Effect on Charge Transport and Recombination. Adv. Energy Mater. 3, 321–327.

Juška, G., Nekrašas, N., Genevičius, K., Pivrikas, A., 2013. Current Transients in Organic Field Effect Transistors. Appl. Phys. Letters, 102, 163306.

Murthy, D.H.K., Melianas, A., Tang, Z., Juška, G., Arlauskas, K., Zhang, F., Siebbeles, L.D.A., Inganäs, O., Savenije, T.J., 2013. Origin of Reduced Bimolecular Recombination in Blends of Conjugated Polymers and Fullerenes. Adv. Funct. Mater, 23, 4262–4268.

International Research Projects

Ensuring Stability in Organic Solar Cells- ESTABLIS (FP7 ITN Marie-Curie).

This project will train 4 postdocs and 11 PhD students to develop the materials and techniques required to give cheap organic solar cells 10-year stabilities. Scientific objectives are: production materials with increased stabilities, clarification of photo(chemical) and mechanical degradation pathways, manufacturing organic solar cells with reduced inter-layer contaminations and increased inter-facial adhesion. Industrials partners: Belectric, Heraeus, Merck.

Main publications:

Stephen, M., Važgėla, J., Genevičius, K., Juška, G., Arlauskas, K., 2013. Mobility and recombination of the charge carriers in the organic bulk heterojunctions with different compositions, UFPS-15, 51.

Contractual Research

Consulting Agreement. Stora Enso Oyj, Helsinky, Finland, 2010–2014.

R&D Consulting Services Agreement. BASF Schweiz AG, Switzerland, 2013.

Consulting Agreement. Lappeenranta University of Technology, Finland, 2011–2013.

MAIN R&D&I (RESEARCH, DEVELOPMENT AND INNOVATION) PARTNERS

School of Chemistry and Molecular Biosciences, Centre For Organic Photonics and Electronics (COPE), University of Queensland (Australia)
Thunder Bay Research Institute, Thunder Bay (Canada)

OTHER SCIENTIFIC ACTIVITIES

Prof. G. Juška –

  • editorial board member of the Lithuanian Journal of Physics.

DEPARTMENT OF THEORETICAL PHYSICS

9 Saulėtekio, LT-10222 Vilnius
Tel. 236 6030, fax 236 6003
E-mail: \

Head – Prof. Habil. Dr. Leonas Valkūnas

STAFF

Professors: Prof. Habil. Dr. L. Valkūnas (part-time), Prof. Habil. Dr K. Pyragas (part-time), prof. Dr. D. Abramavičius, prof. Dr. E. Anisimovas.
Associate professors: Doc. Dr. J. Bučinskas, Doc. Dr. J. Šulskus, Doc. Dr. K. Glemža, Dr. T. Gajdosik, Dr. G.Trinkūnas.
Lecturers: Dr. O. Rancova, Dr. M. Mačernis.
Doctoral students: V. Balevičius, V. Butkus, J. Chmeliov, J. Meldaikis, S. Toliautas, S. Malickaja, V. Abramavičius, A. Gelžinis.

Processes Modelling Laboratory at the Department of Theoretical Physics

Head – Dr. Mindaugas Mačernis

RESEARCH INTERESTS

Development of exciton theory and its application to the nonlinear spectroscopy of molecular complexes
Excitation dynamics in complex molecular systems and nanostructures
Coherent control and optimization of nonlinear optical signals of bio molecules and nano-systems
Development of the theoretical background of multi-dimensional spectra of molecular complexes
Modelling of single molecular spectra of complex systems
Development of quantum mechanics and quantum electrodynamics for characterization of transitions in atoms, molecules and molecular complexes
Application of high performance parallel computing in theoretical modeling of processes in photoactive organic matherials and nanosystems

RESEARCH PROJECTS CARRIED OUT IN 2013

Project Supported by University Budget

Modeling of Processes in Photoactive Organic Matherials and Nanosystems. Prof. L. Valkūnas. 2011–2018.

Role of xanthophyll molecules in determining the light harvesting efficiency has been investigated by using the Time Dependent Density Functional (TD-DFT) method. Coulombic interactions between optically allowed S2 state of the xanthophyll and the Soret band states of chlorophylls in major light harvesting and CP29 complexes from the photosystem II have been investigated. For the analysis of the spectral dynamics from the coherent 2D spectroscopy, possibility to construct the spectral maps from the 2D spectra was suggested.

Main publications:

Duffy, C. D. P., Valkunas, L., Ruban, A.V., 2013. Quantum mechanical calculations of xanthophyll-chlorophyll electronic coupling in the light-harvesting antenna of photosystem II of higher plants. J. Phys. Chem. B 117, 7605–7614.

Vengris, M., Larsen, D.S., Valkunas, L., Kodis, G., Herrero, C., Gust, D., Moore, T., Moore, A., van Grondelle, R., 2013. Separating annihilation and excitation energy transfer dynamics in light harvesting systems. J. Phys. Chem. B 117, 11372–11382.

Butkus, V., Zigmantas, D., Abramavicius, D., Valkunas, L., 2013. Distinctive character of electronic and vibrational coherences in disordered molecular aggregates. Chem. Phys. Lett. 587, 93–98.

National Research Projects

Research Council of Lithuania. Modeling and Control of Exciton Quantum Dynamics in Nanostructures (No: VP1-3.1-ŠMM-07-K-01-020). Prof. D. Abramavičius. 2012–2015.

The research has focused on molecular nanostructures. It has been demonstrated that excitonic third order spectrum of a periodic molecular crystal can be obtained analytically using the exciton scattering matrix technique. In the presence of disorder numerical propagation method is necessary. By studying exciton scattering dynamics in disordered lattice it has been demonstrated that the exciton delocalization length can be related to peak lineshapes in 2D coherent spectra of disordered J aggregates.

Main publications:

Han, J., Zhang, H., Abramavičius, D., 2013. Exchange narrowing and exciton delocalization in disordered J aggregates: Simulated peak shapes in the two dimensional spectra. J. Chem. Phys. 139, 034313.

Abramavicius, D., 2013. Exciton-exciton scattering in a one-dimensional J aggregate. European Physics Letters (EPL), 101, 57007.

Research Council of Lithuania. Nonequilibrium Photo-Induced Processes in Molecular Aggregates (No: MIP-069/2012). Prof. D. Abramavičius. 2013–2015.

The influence of intra-molecular vibrations onto the coherent two dimensional spectroscopy signals of the strongly coupled molecular aggregates has been described. The vibrations have been showed to yield excitonic polarons, which have been studied by applying the time-dependent variational principle. At finite temperature the stochastic dynamics of an excitation using has been modeled.

Main publications:

Lewis, K.L.M., Fuller, F.D., Myers, J.A., Yocum, C.F., Mukamel, S., Ogilvie, J.P., Abramavicius, D., 2013. Simulations of the Two-Dimensional Electronic Spectroscopy of the Photosystem II Reaction Center. J. Phys. Chem. A, 117, 34−41.

Gelzinis, A., Valkunas, L., Fuller, F.D, Ogilvie, J.P., Mukamel, S., Abramavicius D., 2013. Tight-binding model of the photosystem II reaction center: application to two-dimensional electronic spectroscopy. New J. Phys, 15, 1–26, 2013.

Chmeliov, J., Songaila, E., Rancova, O., Gall, A., Robert, B., Abramavicius, D., Valkunas, L., 2013. Excitons in the LH3 complexes from purple bacteria. J. Phys. Chem. B, 117, 11058−11068.

MAIN R&D&I (RESEARCH, DEVELOPMENT AND INNOVATION) PARTNERS

Centre of Physical Sciences and Technology (Lithuania)
University of California, Berkeley, and University of California, Irvine (USA)
Institute of Physics of Charles University (Czech Republic)
Institute of Solid State Physics, University of Latvia (Latvia)
Riga Technical University (Latvia)
Free University of Amsterdam (Netherlands)
Free University of Brussels (Belgium)
Lund University (Sweden)
Nuclear Research Centre, Saclay (France)
State key laboratory of supramolecular structure and materials, Jilin University (China)
Dalian Institute of Chemical Physics, Chineese Academy of Sciences (China)
University of Antwerp (Belgium)

Other scientific activities

Prof. L. Valkūnas –

  • member of the Lithuanian Academy of Sciences;
  • editorial board member of the Lithuanian Journal of Physics;
  • Doctor Philosophiaе Honoris Сausa from thе Boglyubov Institute for Тhеorеtiсal Physiсs, Kiev, Ukraine.

Prof. K. Pyragas –