Observation of backscattering-immune chiral electromagnetic modes without time reversal breaking

Abstract

A strategy is proposed to realize robust transport in time reversal invariant photonic system. Using numerical simulation and microwave experiment, we demonstrate that a chiral guided mode in the channel of a three-dimensional dielectric woodpile photonic crystal is immune to the scattering of a square patch of metal or dielectric inserted to block the channel. The chirality based robust transport can be realized in nonmagnetic dielectric materials without any external field.

16 pages, 5 figures

References in corpus (2)

• A topological Dirac insulator in a quantum spin Hall phase : Experimental observation of first strong topological insulator
• Reflection-Free One-Way Edge Modes in a Gyromagnetic Photonic Crystal

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