Dimitris PapazoglouDimitris Papazoglou

Assistant Professor ,

Affiliated faculty IESL-FORTHSenior member of the UNIS group

PhD: 1998, Aristotle University of Thessaloniki, Physics

Research activity is taking place in IESL-FORTH facilities

Ultra-intense nonlinear interactions and sources (UNIS) lab

Bibliometric info: 42 publications, 304 citations, h factor: 11

General research area: Optics (experimentalist)

Nonlinear interactions of ultra-short laser pulses with transparent media

Nonlinear interactions of ultra-short laser pulses with transparent media

Exotic optical waves and light bulletsExotic optical waves and light bullets

Wavefront sensing and manipulationWavefront sensing and manipulation

Research activitiesResearch activities

Active collaborationsActive collaborations

Stelios Tzortzakis (IESL-FORTH)

Nikos Efremidis (UOC)

George Stegeman (CREOL)

Demetrios Christodoulides (CREOL)

Stelios Tzortzakis (IESL-FORTH)

Nikos Efremidis (UOC)

George Stegeman (CREOL)

Demetrios Christodoulides (CREOL)

Physical mechanism ?

Physical mechanism ?

Thermal processThermal process

Photochemical process

Photochemical process

Most of the experimental results were inconclusive

since they were based on the post

processing of the samples

Photonic structuring in transparent media Photonic structuring in transparent media

D.G. Papazoglou et al., Opt. Lett. 31, 1441 (2006) , D. G. Papazoglou et al., Opt. Lett., 32, 2055 (2007),D.G. Papazoglou et al., (invited) to appear in Optical Materials Express (2011)

By in-situ studying the spatiotemporal dynamics we

are lead to a better understanding of the physical

process. Our results clearly support a photochemical mechanism for low repetition rate laser

sources!

By in-situ studying the spatiotemporal dynamics we

are lead to a better understanding of the physical

process. Our results clearly support a photochemical mechanism for low repetition rate laser

sources!

i-HOM (In-line holographic microscopy)i-HOM (In-line holographic microscopy)

Spatial distribution of the perturbed refractive index and respective electron density in a central

longitudinal section of a plasma string formed in air

Spatial distribution of the perturbed refractive index and respective electron density in a central

longitudinal section of a plasma string formed in air

High resolution pump-probe experimental technique that is capable of resolving small refractive index changes (~ 10-4 ) in m sized focal volumes

High resolution pump-probe experimental technique that is capable of resolving small refractive index changes (~ 10-4 ) in m sized focal volumes

D.G. Papazoglou et al, Appl. Phys. Lett., 93, 041120 (2008)

Using coma aberration to generate intense Airy beamsUsing coma aberration to generate intense Airy beams

Coma aberration Cubic phase !

G. A. Siviloglou, et al., Phys. Rev. Lett., 99, 213901 (2007)

Airy beams are a non-dispersive solution of

the 1D paraxial propagation equation

Optical aberrations can be envisioned as a way to impose polynomial phase distributions on plane wave!

D. G. Papazoglou, et al., Phys. Rev. A, 81, 061807(R) (2010)

cubic phase modulation

Spatiotemporal Airy Light Bullets in the Linear and Nonlinear RegimesSpatiotemporal Airy Light Bullets in the Linear and Nonlinear Regimes

D. Abdollahpour, et. al. Phys. Rev. Lett., 105, 253901 (2010)

By combining a spatial Airy beam with an Airy pulse in time we have generated intense Airy-Airy-Airy (Airy3) light bullets

The Airy3 light bullets do not require any specific tuning of the material optical properties for their formation and withstand both diffraction and

dispersion during their propagation. The Airy3 light bullets are robust up to the high

intensity regime since they are capable of self-healing the nonlinearly induced distortions of their

spatiotemporal profile

Intensity iso-surface of the experimentally realized Airy3 light bullet Spatiotemporal self healing of the Airy3 light bullet