Kestutis Staliunas

Kestutis Staliunas

Universitat Polit├Ęcnica de Catalunya

Engineering Sciences

Graduated Theoretical Physics, Vilnius University, Lithuania, 1985. PhD in Physics, Vilnius University, 1989. Habilitation in Physics, Vilnius University, 2001. A.v. Humboldt fellow in Physikalisch-Technische Bundesantstalt (PTB) Braunschweig, Germany, 1991-1992.  Senior research fellow in Braunschweig PTB and University of Hannover on nonlinear pattern formation in laser systems and Bose condensates 1993-2003. Since 2004 ICREA research professor in Universitat Polit├Ęcnica de Catalunya (UPC), Barcelona, head of research group (DONLL) on lasers, photonics and meta-photonics, nonlinear laser dynamics. Professional experience: around 250 articles in scientific journals with more than 7000 citations (h-factor 49); appr. 500 presentations in conferences (more than 100 invited ones); 4 patents, 2 monographs. Up to now directed (or currently directing) 20 PhD projects.

Research interests

Spatial quality of laser beams is of high importance in technologies: good quality beams propagate better collimated, can be more tight focused. Not all lasers, however, produce good beams: the radiation of especially very important semiconductor microlasers, microchip lasers,VCELSs, are too random and divergent. We develop new physical concepts and new techniques to manipulate the spatial structure of radiation, by using micro-modulated photonic materials: photonic crystals, metamaterials, Non-Hermitian optical materials. We develop these novel light-manipulation techniques in fundamental level and implement them in photonic industry. Also the good quality beams of microwaves, sound waves, or matter waves are required. We apply our experience in "smart manipulation of light patterns" to the other types of waves, to produce "clean" and well directed sound beams by so called "sonic crystals" in acoustics, as well as "clean" matter wave ensembles in modulated Bose condensates.

Selected publications

- Akhter MN, Ivars SB, Botey M, Herrero R & Staliunas K 2023, 'Non-Hermitian Mode Cleaning in Periodically Modulated Multimode Fibers', Physical Review Letters, 131, 4, 043604.
- Ivars SB, Botey M, Herrero R & Staliunas K 2023, 'Stabilisation of spatially periodic states by non-Hermitian potentials', Chaos Solitons & Fractals, 168, 113089.
- Babayigit C, Grineviciute L, Nikitina J, Melnikas S, Gailevicius D & Staliunas K 2023, 'Inverse designed photonic crystals for spatial filtering', Applied Physics Letters, 122, 24, 244103.
- Lukosiunas I, Grineviciute L, Nikitina J, Gailevicius D & Staliunas K 2023, 'Extremely narrow sharply peaked resonances at the edge of the continuum', Physical Review A, 107, 6, L061501.
- Plukys M, Gaizauskas E, Gailevicius D & Staliunas K 2023, 'Transverse modes and beam spatial quality in microchip lasers', Physical Review A, 107, 4, 043505.
- Ahmed WW, Farhat M, Staliunas K et al. 2023, 'Machine learning for knowledge acquisition and accelerated inverse-design for non-Hermitian systems', Communications Physics, 6, 1, 2.

Selected research activities

-Keynote presentation: CLEO Europe/EQEC'23, Munich
-Invited talks: SPIE'23 Prague, Photonic West'23 San Francisco, META'23 Paris, ICTON'23 Bucharest;
-Committees: CLEO Europe/EQEC, SPIE Europe