All-Passive Nonreciprocal Metasurface

TL;DR

This paper presents a systematic design of all-passive metasurfaces that exhibit nonreciprocal wave flow, including a novel quasi-2D metasurface mimicking Faraday rotation without external bias, enabling passive nonreciprocal devices.

Contribution

It introduces a new systematic approach for passive nonreciprocal metasurfaces and proposes a paradigm for bias-free nonreciprocal wave manipulation in quasi-2D structures.

Findings

Design of high-performance all-passive nonreciprocal metasurfaces

Development of a bias-free quasi-2D metasurface mimicking Faraday rotation

Potential for passive nonreciprocal systems and devices

Abstract

We introduce a systematic approach to design all-passive subwavelength high performance metasurfaces that exhibit nonreciprocal properties and achieve wave-flow isolation. Moreover we build upon those findings and propose a new paradigm for a quasi-2D metasurface that mimic the nonreciprocal property of Faraday rotation without using any magnetic or electric biasing. We envision that the proposed approaches may serve as a building block for all-passive time-reversal symmetry breaking with potential applications for future nonreciprocal systems and devices.