In the UNIS group we are working in the field of intense ultrashort laser pulse interaction with matter. Our activities are grouped in 3 directions.

We study the nonlinear propagation of intense ultrashort laser pulses in transparent media and related filamentation processes. We develop experimental tools to monitor the interaction of the strong laser fields with the matter and also ways to control the nonlinear propagation through the use of "exotic" wavepackets or photonic lattices.

In the second direction we develop novel strong field THz sources. We are investigating mainly filamentation based approaches and explore novel ways for increasing the source peak power. We are proposing ways of taming the source properties through filamentation tailoring methods or using novel artificial materials like metamaterials and eutectics. With the available THz intensities we explore the new era of nonlinear THz optics.

Finally, in the third direction we use photonic lattices for a number of applications. From the control of the nonlinear propagation, to the study of complexity physics and quantum information and quantum analogs.

In our research we are dealing with both fundamental science aspects as well as technological applications. The polyvalent nature of our facility allows studies in cross-disciplinary science including physics, chemistry, materials science and bio-medicine.




  •  Rozhdestvensky honorary medal from the Russian Optical Society (2013) for Prof. Stelios Tzortzakis

  •  Marie Curie Excellence Grant (~2M€ ; 2006-2010)  Prof. Stelios Tzortzakis

Research Highlights

  •  First demonstration of nonlinear intense “light bullets” in normal dispersion media.

  •  First demonstration of X-waves during the nonlinear propagation of intense laser pulses in air.

  •  First demonstrations of dynamical filamentation tailoring in various media and photonic lattices.

  •  First demonstration of selectively exciting specific phonons in semiconductors using intense ultrashort THz radiation - a breakthrough result opening the way to mode-selective chemistry and Biology.

  •  THz agile metamaterials: dynamical ultrafast switches and tunable THz waveplates.

Mid- and far-IR optoelectronic devices based on Bose-Einstein condensation
Observation of extremely efficient terahertz generation from mid-infrared two-color laser filaments
A. D. Koulouklidis, C. Gollner, V. Shumakova, V. Yu. Fedorov, A. Pugžlys, A. Baltuška, S. Tzortzakis
Nature Communications, Volume:11, Issue:1, Page:1, Year:2020, DOI:doi.org/10.1038/s41467-019-14206-x
Phase Memory Preserving Harmonics from Abruptly Autofocusing Beams
A. D. Koulouklidis, D. G. Papazoglou, V. Y. Fedorov, and S. Tzortzakis
Phys.Rev.Lettters, Volume:119, Page:223901, Year:2017, DOI:https://doi.org/10.1103/PhysRevLett.119.223901
Janus Waves
D. G. Papazoglou, V. Y. Fedorov, and S. Tzortzakis
Janus Waves, Volume:41, Page:4656-4659, Year:2016, DOI:https://doi.org/10.1364/OL.41.004656
Optimal wavelength for two-color filamentation-induced terahertz sources
Vladimir Yu Fedorov, Stelios Tzortzakis
OSA, Volume:26, Issue:24, Page:31150-31159, Year:2018, DOI:https://doi.org/10.1364/OE.26.031150
Extreme THz fields from two-color filamentation of midinfrared laser pulses
Vladimir Yu Fedorov, Stelios Tzortzakis
PHYSICAL REVIEW A, Volume:97, Issue:6, Page: 063842, Year:2018, DOI:https://doi.org/10.1103/PhysRevA.97.063842
Ring-Airy beams at the wavelength limit
Manousidaki, Maria; Fedorov, Vladimir Yu; Papazoglou, Dimitrios G; Farsari, Maria; Tzortzakis, Stelios
Optics Letters, Volume:43 , Issue:5, Page:1063-1066, Year:2018, DOI:doi.org/10.1364/OL.43.001063
Highly efficient broadband terahertz generation from ultrashort laser filamentation in liquids
Indranuj Dey, Kamalesh Jana, Vladimir Yu. Fedorov, Anastasios D. Koulouklidis, Angana Mondal, Moniruzzaman Shaikh, Deep Sarkar, Amit D. Lad, Stelios Tzortzakis, Arnaud Couairon, G. Ravindra Kumar
Nature Communications, Volume:8, Issue:1184, Year:2017, DOI:https://doi.org/10.1038/s41467-017-01382-x
Crossing the threshold of ultrafast laser writing in bulk silicon
Margaux Chanal, Vladimir Yu. Fedorov, Maxime Chambonneau, Raphaël Clady, Stelios Tzortzakis, David Grojo
Nature Communications, Volume:8, Issue:773, Year:2017, DOI:https://doi.org/10.1038/s41467-017-00907-8
Non-diffracting states in one-dimensional Floquet photonic topological insulators
Matthieu Bellec, Claire Michel, Haisu Zhang, Stelios Tzortzakis, Pierre Delplace
EPL, Volume:119, Issue:1, Page:14003, Year:2017, DOI:https://doi.org/10.1209/0295-5075/119/14003
Invariant superoscillatory electromagnetic fields in 3D-space
KG Makris, DG Papazoglou, S Tzortzakis
Journal of Optics, Volume:19, Issue:1, Page:014003, Year:2016, DOI:https://doi.org/10.1088/2040-8986/19/1/014003
Tailored light sheets through opaque cylindrical lenses
Diego Di Battista, Daniele Ancora, Haisu Zhang, Krystalia Lemonaki, Evangelos Marakis, Evangelos Liapis, Stelios Tzortzakis, Giannis Zacharakis
OPTICA, Volume:3, Issue:11, Page:1237-1240, Year:2016, DOI:https://doi.org/10.1364/OPTICA.3.001237
THz generation by two-color femtosecond filaments with complex polarization states: four-wave mixing versus photocurrent contributions
VY Fedorov, AD Koulouklidis, S Tzortzakis
Plasma Physics and Controlled Fusion, Volume:59, Issue:1, Page:014025, Year:2016, DOI:https://doi.org/10.1088/0741-3335/59/1/014025
Accessing extreme spatiotemporal localization of high-power laser radiation through transformation optics and scalar wave equations
V Yu Fedorov, M Chanal, D Grojo, S Tzortzakis
PHYSICAL REVIEW LETTERS, Volume:117, Issue:4, Page:043902, Year:2016, DOI:https://doi.org/10.1103/PhysRevLett.117.043902
Erratum: “Robust authentication through stochastic femtosecond laser filament induced scattering surfaces” [Appl. Phys. Lett. 108, 211107 (2016)]
H Zhang, D Di Battista, G Zacharakis, S Tzortzakis
Applied Physics Letters, Volume:109, Issue:3, Page:039901, Year:2016, DOI:https://doi.org/10.1063/1.4959265
Enhanced terahertz wave emission from air-plasma tailored by abruptly autofocusing laser beams
K Liu, AD Koulouklidis, DG Papazoglou, S Tzortzakis, XC Zhang
OPTICA, Volume:3, Issue:3, Page:605-608, Year:2016, DOI:https://doi.org/10.1364/OPTICA.3.000605
Robust authentication through stochastic femtosecond laser filament induced scattering surfaces
H Zhang, S Tzortzakis
Applied Physics Letters, Volume:108, Issue:21, Page:211107, Year:2016, DOI:https://doi.org/10.1063/1.4952716
Abruptly autofocusing beams enable advanced multiscale photo-polymerization
M Manousidaki, DG Papazoglou, M Farsari, S Tzortzakis
OPTICA, Volume:3, Issue:5, Page:525-530, Year:2016, DOI:https://doi.org/10.1364/OPTICA.3.000525
Spectral bandwidth scaling laws and reconstruction of THz wave packets generated from two-color laser plasma filaments
AD Koulouklidis, V Yu Fedorov, S Tzortzakis
PHYSICAL REVIEW A, Volume:93, Issue:3, Page:033844, Year:2016, DOI:https://doi.org/10.1103/PhysRevA.93.033844
Structured adaptive focusing through scattering media
Diego Di Battista, Daniele Ancora, Haisu Zhang, Krystalia Lemonaki, Stella Avtzi, Stelios Tzortzakis, Marco Leonetti, Giannis Zacharakis
Proc. SPIE - Adaptive Optics and Wavefront Control for Biological Systems II, Volume:9717, Page:971719, Year:2016, DOI:https://doi.org/10.1117/12.2211594
Nonlinear plasma-assisted collapse of ring-Airy wave packets
Paris Panagiotopoulos, Arnaud Couairon, Miroslav Kolesik, Dimitris G Papazoglou, Jerome V Moloney, Stelios Tzortzakis
PHYSICAL REVIEW A, Volume:93, Issue:3, Page:033808, Year:2016, DOI:https://doi.org/10.1103/PhysRevA.93.033808
Extreme events in complex linear and nonlinear photonic media
M Mattheakis, IJ Pitsios, GP Tsironis, S Tzortzakis
Chaos, Solitons & Fractals, Volume:84, Page:73-80, Year:2016, DOI:https://doi.org/10.1016/j.chaos.2016.01.008
Study of THz emission from ring-Airy beam induced plasma
Kang Liu, D. G. Papazoglou, A. D. Koulouklidis, S. Tzortzakis, X.-C. Zhang
IEEE, Page:1-2, Year:2015, DOI:https://doi.org/10.1109/IRMMW-THz.2015.7327523
Fano resonances in THz metamaterials composed of continuous metallic wires and split ring resonators
Zhaofeng Li, Semih Cakmakyapan, Bayram Butun, Christina Daskalaki, Stelios Tzortzakis, Xiaodong Yang, Ekmel Ozbay
OPTICS EXPRESS, Volume:22, Issue:22, Page:26572-26584, Year:2014, DOI:https://doi.org/10.1364/OE.22.026572
Controlling high-power autofocusing waves with periodic lattices
P Panagiotopoulos, DG Papazoglou, A Couairon, S Tzortzakis
Optics Letters, Volume:39, Issue:16, Page:4958-4961, Year:2014, DOI:https://doi.org/10.1364/OL.39.004958
Physics of the conical broadband terahertz emission from two-color laser-induced plasma filaments
Andrei Gorodetsky, Anastasios D Koulouklidis, Maria Massaouti, Stelios Tzortzakis
PHYSICAL REVIEW A, Volume:89, Issue:3, Page:033838, Year:2014, DOI:https://doi.org/10.1103/PhysRevA.89.033838
A Waveguide Made of Hot Air
Arnaud Couairon, Stelios Tzortzakis
Physics, Volume:7, Issue:21, Year:2014, DOI:https://doi.org/10.1103/Physics.7.21
Advanced Multiphoton Polymerization using Tunable Shaped Laser Wavepackets
Maria Manousidaki, Vladimir Yu. Fedorov, Dimitrios G. Papazoglou, Maria Farsari, and Stelios Tzortzakis
Year: 2018, ISBN:978-1-943580-46-0
Precise Holographic Measurements Reveal High Electron Densities in Mid-Infrared Laser Filaments in Air
D. G. Papazoglou, V. Shumakova, S. Ališauskas, V. Yu. Fedorov, A. Pugžlys, A. Baltuška, and S. Tzortzakis
Year: 2018, ISBN:978-1-943580-42-2
Observation of Strong THz Fields from Mid-Infrared Two-Color Laser Filaments
A. D. Koulouklidis, C. Gollner, V. Shumakova, V. Yu. Fedorov, A. Pugžlys, A. Baltuška, and S. Tzortzakis
Year: 2018, ISBN:978-1-943580-42-2
Extremely Bright THz Radiation from Two-color Filamentation of Mid-infrared Laser Pulses
Vladimir Yu. Fedorov, Stelios Tzortzakis
Year: 2018, ISBN:978-1-943580-42-2
Impact of Polarization on Mid-IR Air Filaments
V. Shumakova, C. Gollner, A. Baltuška, V. Yu. Fedorov, S. Tzortzakis, A. Voronin, A.V. Mitrofanov, A.M. Zheltikov, D. Kartashov, A. Pugžlys
Year: 2018, ISBN:978-1-943580-42-2
Exceeding the bulk modification threshold of silicon with hyper-focused infrared femtosecond laser pulses
Margaux Chanal, Vladimir Yu Fedorov, Maxime Chambonneau, Raphaël Clady, Olivier Utéza, Stelios Tzortzakis, David Grojo
Year: 2017, ISBN:978-1-5090-6736-7
Sculptured ultrashort laser wave packets for advanced materials engineering
Stelios Tzortzakis
Year: 2017, ISBN:978-1-5090-6736-7
Strong power upscaling of THz sources based on laser filamentation in transparent media
A. D. Koulouklidis, I. Dey, C. Daskalaki, V. Yu. Fedorov, K. Jana, A. Mondal, M. Shaikh, D. Sarkar, A. D. Lad, G. R. Kumar, A. Couairon, S. Tzortzakis
Year: 2017, ISBN:978-1-5090-6736-7
Cavity ring-down spectroscopy for the isotope ratio measurement of methane in ambient air with DFB diode laser near 1.65 μm
A Bicer, J Bounds, F Zhu, AA Kolomenskii, S Tzortzakis, HA Schuessler
Year: 2017, ISBN:978-1-5090-6736-7
Enhancing THz radiation from two-color laser-induced air-plasma by using abruptly autofocusing beams
Kang Liu, A. D. Koulouklidis, D. G. Papazoglou, S. Tzortzakis, X.-C. Zhang
Year: 2016, ISBN:978-1-943580-19-4
Linear and nonlinear exotic light wave packets physics and applications
Stelios Tzortzakis
Year: 2015, ISBN:978-1-943580-03-3
Reconstruction of ultra-broadband THz electric field distorted by electooptic sampling
A. D. Koulouklidis, V. Yu. Fedorov, S. Tzortzakis
Year: 2015, ISBN:978-1-4673-7475-0


Prof. Tzortzakis Stelios
University Faculty Member

Scientific Staff

Prof. Papazoglou Dimitrios
University Faculty Member

Technical Staff

Mr. Loulakis Michael
Ms. Daskalaki Christina

Research Associates

Dr. Koulouklidis Anastasios
PostDoctoral Fellow
Dr. Fedorov Vladimir
PostDoctoral Fellow
Dr. Manousidaki Mary
PostDoctoral Fellow


Mr. Mansour Dimitrios
Ph.D. student


Ms. Lanara Christina
M.Sc. student