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Vladan Vuletić (Department of Physics, Massachusetts Institute of Technology, USA)29/08/2022, 11:30
The last few years have seen a remarkable development in our ability to control many neutral atoms individually, and induce controlled interactions between them on demand. This progress ushers in a new era where one can create highly entangled states, or study quantum phase transitions. I will present results on atomic arrays containing more than 250 atoms, including transport of entangled...
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Jose Ordonez-Miranda (Institute of Industrial Science, The University of Tokyo, Tokyo 153-8505, Japan; LIMMS, CNRS-IIS UMI 2820, The University of Tokyo, Tokyo 153-8505, Japan)29/08/2022, 14:30
Thermal waves generated by the periodic fluctuations on time of a temperature field are widely used to determine thermal properties of macro-, micro-, and nanomaterials via standard photothermal techniques (thermoreflectance, radiometry, 3w, photoacoustics, and resonant cavity), and they usually do not carry a net heat flux in materials with constant thermal properties. By contrast, in...
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Dr Vadim Sirkeli (Faculty of Physics and Engineering, Moldova State University, Chisinau, Moldova)29/08/2022, 15:00
Zinc selenide is a wide bandgap semiconductor which is attractive for the fabrication of many optoelectronic devices, including ultraviolet (UV) photodetectors, due to its large bandgap energy (2.67 eV at 300 K), high electric breakdown field strength (~ 1 MV/cm), as well as high resistance to intense UV and X-ray radiation. Most commercial UV-photodetectors are based on Si or GaAs...
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Prof. Alexander Dreischuh (Sofia University "St. Kliment Ohridski, Bulgaria)29/08/2022, 15:15
One of the processes that is assumed to be well understood, is that any fundamental Gaussian light beam experiences an axial phase shift of $π$ radians with respect of a reference plane wave when passing through its focus. For a higher-order Hermite-Gaussian mode with mode indices ($m,n$) this phase is multiplied by a factor of ($1+m+n$). For a higher-order Laguerre-Gaussian mode with mode...
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Ana Mancic (Faculty of Sciences and Mathematics, University of Nis)29/08/2022, 18:00
Flat-band (FB) photonic lattices are attracting substantial attention of researchers since they provide an excellent platform for studying various fundamental physical phenomena difficult to achieve in the condensed matter systems. In that regard, some of those phenomena demonstrated in the last two decade are discrete solitons, dynamical localization and Anderson localization in disordered...
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Milica Perić (Department of Physics, Faculty of Sciences and Mathematics, University of Niš, Serbia)29/08/2022, 18:00
Group velocity control of light is of fundamental as well as practical interest for the construction of various optical devices such as optical buffers and quantum memories. In recent decades, great attention has been paid to the study of conditions and techniques for obtaining subluminal and superluninal light. It is found that the presence of Kerr nonlinearity can be usefull tool for group...
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Milutin Stepić (COHERENCE, Department of Atomic Physics, Vinča Institute of Nuclear Sciences, National Institute of Republic of Serbia, University of Belgrade)29/08/2022, 18:00
Flatband (FB) photonic systems have been in the spotlight of researchers since they represent an advantageous testbed for studying transport and localization properties at the linear level [1]. Among variety of platforms where flatbands have been realized photonic lattices have been established as the ideal ones, since working with them is very comfortable - they are easy to manipulate with...
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Dr Lyubomir Stoyanov (Institute of Optics and Quantum Electronics, Friedrich Schiller University, Germany & Department of Quantum Electronics, Faculty of Physics, Sofia University "St. Kliment Ohridski", Bulgaria)29/08/2022, 18:00
Coherent beam combining (CBC) is denoting a group of methods developed for achieving higher power/energy and for enhancing the spectral brightness of laser emission at preserved beam quality by combining several high-power laser beams (or sub-beams) [1]. On the other hand, the spectral broadening of coherent optical pulses is inevitably necessary for their compression in time. The beam...
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Dr Gabriel Buse (West University of Timisoara)29/08/2022, 18:00
The spectroscopic properties of $ns^2$ ions in alkaline halide crystals are old and well-studied [1]. Regarding the spectroscopic properties of ns2 ions doped in alkaline-earth fluorides, these are less investigated. Few authors [2,3,4] have studied the optical properties of CaF$_2$:Pb$^{2+}$ crystals and LuAG:Ce single crystalline films. Recently, the effect of gamma irradiation on the...
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Dr Silvana Mico (University of Tirana)29/08/2022, 18:00
This work aimed to review the optical properties of aerosol particles and the approximations developed to describe them. Aerosol particles have a significant effect on the total radiation balance. During the interaction of light with matter, two main phenomena can be observed, scattering and absorption of light, depending on matter's wavelength and optical characteristics of aerosols.
The...
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Katarina Djordjevic (University of Belgrade, „VINČA” Institute of Nuclear Sciences - National Institute of thе Republic of Serbia, University of Belgrade, PO box 522, 11000 Belgrade, Serbia)29/08/2022, 18:00
The idea of this paper is to develop a method for determination thermal diffusivity, linear expansion coefficient and thickness of a semiconductor sample from photoacoustic phase measurement by using neural network. The neural network has been trained on a large basis of photoacoustic phases obtained from a theoretical Si n-type model in the range of 20Hz to 20kHz. The advantages of using a...
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Ms Gergana Mihova (Faculty of Physics, Sofia University "St. Kliment Ohridski")31/08/2022, 11:00
The presented research aimed to study the microhardness, wettability as well as the surface roughness of organic spectacle lenses for everyday use, based on CR-39 (Poly(allyl diglycol carbonate) (PADC).
The modern spectacle lens's organic materials [1], like CR-39, are superior to the old mineral lenses in many aspects, but their major vulnerability to scratches and chemical substances...
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Nikolay Dimitrov (Sofia University "St. Kliment Ohridski")31/08/2022, 11:00
In the first studies of the generation of long-range quasi-non-diffracting Gauss-Bessel beams (GBBs) by creating and annihilating multi-charge optical vortices (OVs) [1-3], calibrated reflective liquid-crystal spatial light modulators are used. Because of their low damage threshold, they are not applicable with high-power laser beams. Vortex phase plates (VPs; phase plates which thickness is...
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Luc Bergé (CEA, DAM, DIF, Arpajon, France)01/09/2022, 09:00
This talk will review different physical mechanisms involved in the emission of secondary radiations, with emphasis on terahertz waves, by laser-gas interactions. At moderate laser intensity, photocurrents can be exploited to perform a coherent terahertz spectroscopy of various crystals from air plasmas or to image tunneling electron wave packets from probing the polarization state of...
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