NonReciprocal Wave Propagation in Space-Time Modulated Media
Habib Ammari, Jinghao Cao, Erik Orvehed Hiltunen
Abstract
.We show the possibility of achieving nonreciprocal wave propagation in space-time modulated media and give an asymptotic analysis of the nonreciprocity property in terms of the amplitude of the time modulation. Such modulation causes a folding of the band structure of the material, which may induce degenerate points. By breaking time-reversal symmetry, we show that these degeneracies may open into nonsymmetric, unidirectional band gaps. Finally, we illustrate our results by several numerical simulations.Keywordsnonreciprocal wave propagationunidirectional wavesubwavelength quasifrequencytime modulationspace-time modulated mediummetamaterialband gap structureMSC codes35J0535C2035P2074J20
Topics & Concepts
SpacetimeSpace (punctuation)PhysicsAcousticsComputer scienceQuantum mechanicsOperating systemMetamaterials and Metasurfaces ApplicationsMicrowave Imaging and Scattering AnalysisOptical and Acousto-Optic Technologies