Nonreciprocity in Bianisotropic Systems with Uniform Time Modulation
| Autor: | Ana Díaz-Rubio, Shanhui Fan, Mohammad Sajjad Mirmoosa, G. A. Ptitcyn, Sergei A. Tretyakov, Viktar Asadchy, Xuchen Wang |
|---|---|
| Přispěvatelé: | Sergei Tretiakov Group, Department of Electronics and Nanoengineering, Stanford University, Swiss Federal Institute of Technology Lausanne, Aalto-yliopisto, Aalto University |
| Jazyk: | angličtina |
| Rok vydání: | 2020 |
| Předmět: |
Physics
Series (mathematics) Wave propagation Circuit design Physical system General Physics and Astronomy FOS: Physical sciences Physics::Optics optical isolation Fundamental frequency Applied Physics (physics.app-ph) Physics - Applied Physics Space (mathematics) Topology 01 natural sciences non-reciprocity metasurface 0103 physical sciences Modulation (music) 010306 general physics device Reciprocal |
| Popis: | openaire: EC/H2020/736876/EU//VISORSURF Physical systems with material properties modulated in time provide versatile routes for designing magnetless nonreciprocal devices. Traditionally, nonreciprocity in such systems is achieved exploiting both temporal and spatial modulations, which inevitably requires a series of time-modulated elements distributed in space. In this Letter, we introduce a concept of bianisotropic time-modulated systems capable of nonreciprocal wave propagation at the fundamental frequency and based on uniform, solely temporal material modulations. In the absence of temporal modulations, the considered bianisotropic systems are reciprocal. We theoretically explain the nonreciprocal effect by analyzing wave propagation in an unbounded bianisotropic time-modulated medium. The effect stems from temporal modulation of spatial dispersion effects which to date were not taken into account in previous studies based on the local-permittivity description. We propose a circuit design of a bianisotropic metasurface that can provide phase-insensitive isolation and unidirectional amplification. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|