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

Abstract

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, ω(θk) (θk: phase velocity direction, associated with the wave vector, k), with the equally important impedance relation, η(θS) (θS: group velocity direction, associated with the Poynting vector, 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.

Generalized Space-Time Engineered Modulation (GSTEM) Metamaterials: A global and extended perspective

“…The situation is more complicated in moving-perturbation systems [e.g., Figure 2(b)] because they involve motion in both frames [e.g., moving interfaces in K and (backward) moving atoms and molecules in ]! Kl Let us still choose the Kl frame on the grounds that moving matter with stationary boundaries is a known problem [84], whereas moving boundaries is a more difficult problem. To enter the metamaterial regime, we homogenize the GSTEM by prescribing subwavelength…”

Analysis of gyrobianisotropic media effect on the input impedance, field distribution and mutual coupling of a printed dipole antenna

“…In 30 , the authors investigated the scattering of electromagnetic waves from bounded moving media. They explained the phenomenon of the intraluminal regime of double transmission of waves downstream through a stationary interface between regular medium and moving media.…”

Generalized Space-Time Engineered Modulation (GSTEM) Metamaterials

“…2(b)], because they involve motion in both frames [e.g., moving interfaces in K and (backward) moving atoms and molecules in K ]! Let us still choose the K frame, on the ground that moving matter with stationary boundaries is a known problem [62], whereas moving boundaries is a more difficult problem. To enter the metamaterial regime, we homogenize the GSTEM by prescribing subwavelength [max(λ m ) min(λ)] and subperiod [max(T m ) min(T )] operation.…”