Topological Optical Achirality

TL;DR

This paper demonstrates that any reciprocal single-mode optical structure can be rendered optically achiral from certain incident directions, regardless of its shape or materials.

Contribution

It establishes a universal property of reciprocal single-mode structures, showing their achirality under specific incident wave directions.

Findings

Existence of achiral incident directions for all reciprocal single-mode structures

Achirality is independent of geometric shape or material composition

Universal property applicable to diverse optical structures

Abstract

For arbitrary reciprocal single-mode structures, regardless of their geometric shapes or constituent materials, there must exist incident directions of plane waves for which they are optically achiral.