Nonreciprocity in Bianisotropic Systems with Uniform Time Modulation

X. Wang, G. Ptitcyn, V. S. Asadchy, A. Díaz-Rubio, M. S. Mirmoosa, Shanhui Fan, and S. A. Tretyakov
Phys. Rev. Lett. 125, 266102 – Published 22 December 2020
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Abstract

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.

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  • Received 15 March 2020
  • Accepted 12 October 2020

DOI:https://doi.org/10.1103/PhysRevLett.125.266102

© 2020 American Physical Society

Physics Subject Headings (PhySH)

Condensed Matter, Materials & Applied Physics

Authors & Affiliations

X. Wang1,*, G. Ptitcyn1,*, V. S. Asadchy2,*, A. Díaz-Rubio1, M. S. Mirmoosa3, Shanhui Fan2, and S. A. Tretyakov1

  • 1Department of Electronics and Nanoengineering, Aalto University, P.O. Box 15500, FI-00076 Aalto, Finland
  • 2Ginzton Laboratory and Department of Electrical Engineering, Stanford University, Stanford, California 94305, USA
  • 3Laboratory of Wave Engineering, Swiss Federal Institute of Technology in Lausanne (EPFL), CH-1015 Lausanne, Switzerland

  • *These authors contributed equally.

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Issue

Vol. 125, Iss. 26 — 31 December 2020

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