L
Lyubomir Stoyanov
Researcher at Sofia University
Publications - 22
Citations - 204
Lyubomir Stoyanov is an academic researcher from Sofia University. The author has contributed to research in topics: Optical vortex & Beam (structure). The author has an hindex of 5, co-authored 21 publications receiving 99 citations.
Papers
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Journal ArticleDOI
Infrared upconversion imaging in nonlinear metasurfaces
Rocio Camacho-Morales,Davide Rocco,Lei Xu,Lei Xu,Lei Xu,Valerio F. Gili,Nikolay Dimitrov,Lyubomir Stoyanov,Zhonghua Ma,Andrei Komar,Mykhaylo Lysevych,F Fouad Karouta,Alexander Dreischuh,Hark Hoe Tan,Giuseppe Leo,Costantino De Angelis,Chennupati Jagadish,Andrey E. Miroshnichenko,Mohsen Rahmani,Mohsen Rahmani,Dragomir N. Neshev +20 more
TL;DR: In this paper, a nonlinear wave-mixing process was used to perform infrared imaging in a metasurface composed of GaAs semiconductor nanoantennas, and the upconversion of short-wave infrared wavelengths via the coherent parametric process of sum-frequency generation was shown.
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Far field diffraction of an optical vortex beam by a fork-shaped grating
TL;DR: In this paper, the authors reported experimental data confirming the analytically predicted transformation of the topological charge (TC) of an input optical vortex (OV) beam, generated by means of fork-shaped binary computer-generated hologram (CGH), after a second forkshaped binary CGH.
Journal ArticleDOI
Infrared up-conversion imaging in nonlinear metasurfaces
Rocio Camacho-Morales,Davide Rocco,Lei Xu,Valerio F. Gili,Nikolay Dimitrov,Lyubomir Stoyanov,Zhonghua Ma,Andrei Komar,Mykhaylo Lysevych,F Fouad Karouta,Alexander Dreischuh,Hark Hoe Tan,Giuseppe Leo,Costantino De Angelis,Chennupati Jagadish,Andrey E. Miroshnichenko,Mohsen Rahmani,Dragomir N. Neshev +17 more
TL;DR: In this article, a nonlinear wave-mixing process was used to perform infrared imaging in a metasurface composed of GaAs semiconductor nanoantennas, and the up-conversion of short-wave infrared wavelengths via the coherent parametric process of sum-frequency generation was shown.
Journal ArticleDOI
Far-field pattern formation by manipulating the topological charges of square-shaped optical vortex lattices
Lyubomir Stoyanov,Georgi Maleshkov,Maya Zhekova,I. L. Stefanov,Dragomir N. Neshev,Gerhard G. Paulus,Alexander Dreischuh +6 more
TL;DR: In this paper, the formation of 10 different structures consisting of bright beams with flat phase fronts in the focus of a lens was demonstrated experimentally in the artificial far field, where the basic structure used is a large, stable, square-shaped optical vortex (OV) array composed of vortices with alternating topological charges.
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Optical waveguiding by necklace and azimuthon beams in nonlinear media
TL;DR: In this paper, a self-focusing bulk photorefractive nonlinear medium (crystal SBN:60) using a frequency-doubled Nd:YVO4 laser at 532 nm was used for parallel all-optical guiding of optical signals at wavelengths.