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2. Transient Cherenkov radiation from an inhomogeneous string excited by an ultrashort laser pulse at superluminal velocity

Author

Arkhipov, R., Babushkin, I., Lebedev, M. K., Tolmachev, Yu. A., and Arkhipov, M. V.

Subjects
Physics - Optics
Abstract

An optical response of one-dimensional string made of dipoles with a periodically varying density excited by a spot of light moving along the string at the superluminal (sub-luminal) velocity is theoretically studied. The Cherenkov radiation in such system is rather unusual, possessing both transient and resonant character. We show that under certain conditions, in addition to the resonant Cherenkov peak another Doppler-like frequency appears in the radiation spectrum. Both linear (small-signal) and nonlinear regimes as well as different string topologies are considered., Comment: accepted to Phys. Rev. A

Published
2014
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3. Analysis of RATAN-600 radio telescope antenna using the MLPO algorithm

Author

Letrou, Christine, Parrot, Christian, Baruh, Amir, Khaikin, Vladimir B., Lebedev, M. K., Boag, Amir, Traitement de l'Information Pour Images et Communications (TIPIC-SAMOVAR), Services répartis, Architectures, MOdélisation, Validation, Administration des Réseaux (SAMOVAR), Institut Mines-Télécom [Paris] (IMT)-Télécom SudParis (TSP)-Institut Mines-Télécom [Paris] (IMT)-Télécom SudParis (TSP), Communications, Images et Traitement de l'Information (CITI), Institut Mines-Télécom [Paris] (IMT)-Télécom SudParis (TSP), Centre National de la Recherche Scientifique (CNRS), Département Informatique (INF), Télécom SudParis (TSP)-Institut Mines-Télécom [Paris] (IMT), Department of Electrical Engineering, Tel Aviv University [Tel Aviv], Special Astrophysical Observatory of the Russian Academy of Sciences (SAO), Russian Academy of Sciences [Moscow] (RAS), and Télécom SudParis & Institut Mines-Télécom Business School, Médiathèque

Subjects
[SPI.ELEC]Engineering Sciences [physics]/Electromagnetism, [SDU.ASTR.IM] Sciences of the Universe [physics]/Astrophysics [astro-ph]/Instrumentation and Methods for Astrophysic [astro-ph.IM], Multilevel algorithm, [SPI.ELEC] Engineering Sciences [physics]/Electromagnetism, Astrophysics::Instrumentation and Methods for Astrophysics, Antenna radiation patterns, Radiotelescopes, Reflector antennas, Physical optics, [SDU.ASTR.IM]Sciences of the Universe [physics]/Astrophysics [astro-ph]/Instrumentation and Methods for Astrophysic [astro-ph.IM]
Abstract

International audience; A fast and adaptive near-field physical optics algorithm is developed for the analysis of general multi-reflector antenna systems. The algorithm is applied to the radiation pattern computation of an extremely large antenna of RATAN-600 radio telescope operating at mm-wave frequencies

Published
2011

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