2020/04/26 by Zoé-Lise Deck-Léger, Deck-Léger, Zoé-Lise, Zheng, Xuezhi +3
Physics and Astronomy · #Quantum optics and atomic interactions #Random lasers and scattering media #Optical and Acousto-Optic Technologies
paper · pdf · doi:10.48550/arxiv.2004.12387
This paper extends current knowledge on electromagnetic wave scattering from\nbounded moving media in several regards. First, it complements the usual\ndispersion relation of moving media, \ω(\θ_\k)\n(\θ_\k: phase velocity direction, associated with the wave\nvector, \k), with the equally important impedance relation,\n\η(\θ_\S) (\θ_\S: group velocity direction,\nassociated with the Poynting vector, \S). Second, it explains the\ninterluminal-regime phenomenon of double-downstream wave transmission across a\nstationary interface between a regular medium and the moving medium, assuming\nmotion perpendicular to the interface, and shows that the related waves are\nsymmetric in terms of the energy refraction angle, while being asymmetric in\nterms of the phase refraction angle, with one of the waves subject to negative\nrefraction, and shows that the wave impedances of the two transmitted waves are\nequal. Third, it generalizes the problem to the case where the medium moves\nobliquely with respect to the interface. Finally, it highlights the connection\nbetween this problem and a spacetime modulated medium.\n