Electromagnetic Wave Scattering from a Moving Medium with Stationary Interface across the Interluminal Regime

Photonics

Zoé-Lise Deck-Léger¹  Christophe Caloz²  Xuezhi Zheng² 

[1] Department of Electrical Engineering, Polytechnique Montréal, 2500, Chemin de Polytechnique, Montréal, QC H3T 1J4, Canada;Faculty of Engineering Science, KU Leuven, P.O. Box 2444, 3001 Leuven, Belgium;

关键词: moving media;    stationary interface;    electromagnetic wave scattering;    bianisotropy;    refractive index patterns;    impedance patterns;   

DOI  :  10.3390/photonics8060202

来源: DOAJ

【 摘 要 】

This paper extends current knowledge on electromagnetic wave scattering from bounded moving media in several regards. First, it complements the usual dispersion relation of moving media, $\omega \left({\theta }_{\mathbf{k}}\right)$ (${\theta }_{\mathbf{k}}$: phase velocity direction, associated with the wave vector, $\mathbf{k}$), with the equally important impedance relation, $\eta \left({\theta }_{\mathbf{S}}\right)$ (${\theta }_{\mathbf{S}}$: group velocity direction, associated with the Poynting vector, $\mathbf{S}$). Second, it explains the interluminal-regime phenomenon of double-downstream wave transmission across a stationary interface between a regular medium and the moving medium, assuming motion perpendicular to the interface, and shows that the related waves are symmetric in terms of the energy refraction angle, while being asymmetric in terms of the phase refraction angle, with one of the waves subject to negative refraction, and shows that the wave impedances of the two transmitted waves are equal. Third, it generalizes the problem to the case where the medium moves obliquely with respect to the interface. Finally, it highlights the connection between this problem and a spacetime modulated medium.

【 授权许可】

Unknown