Nonreciprocal electromagnetic scattering from a periodically space-time modulated slab and application to a quasisonic isolator

By S. Taravati, N. Chamanara, Christophe Caloz. 2017

160 citations recorded by the source corpus.

Scattering of obliquely incident electromagnetic waves from periodically space-time modulated slabs is investigated. It is shown that such structures operate as nonreciprocal harmonic generators and spatial-frequency filters. For oblique incidences, low-frequency harmonics are filtered out in the form of surface waves, while high-frequency harmonics are transmitted as space waves. In the quasisonic regime, where the velocity of the space-time modulation is close to the velocity of the electromagnetic waves in the background medium, the incident wave is strongly coupled to space-time harmonics in the forward direction, while in the backward direction it exhibits low coupling to other harmonics. This nonreciprocity is leveraged for the realization of an electromagnetic isolator in the quasisonic regime and is experimentally demonstrated at microwave frequencies.

Subfields: Electrical and Electronic Engineering, Geophysics, Ocean Engineering

View Paper: https://www.semanticscholar.org/paper/467731aa43196c27b04d95be6eb216be9ef5087b

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Citations in the corpus

• Phase-Induced Frequency Conversion and Doppler Effect With Time-Modulated Metasurfaces (2020, background): “Space–time-varying metamaterials exhibit electric permittivity and/or magnetic permeability modulated in both space and time [31]–[35].”