Synthesis of passive lossless metasurfaces using auxiliary fields for reflectionless beam splitting and perfect reflection

TL;DR

This paper presents a novel method for designing passive, lossless metasurfaces capable of complex beam manipulation, including reflectionless beam splitting and perfect reflection, by using auxiliary evanescent fields to ensure local power conservation.

Contribution

The authors introduce a new paradigm utilizing auxiliary evanescent fields for passive lossless metasurface design, enabling functionalities previously deemed impossible.

Findings

Exact reactive solutions for reflectionless beam splitting.

Verification via full wave simulations.

Achieved perfect reflection with passive lossless metasurfaces.

Abstract

We introduce a paradigm for accurate design of metasurfaces for intricate beam manipulation, implementing functionalities previously considered impossible to achieve with passive lossless elements. The key concept involves self-generation of auxiliary evanescent fields which facilitate the required local power conservation, without interfering with the device performance in the far field. We demonstrate our scheme by presenting exact reactive solutions to the challenging problems of reflectionless beam splitting and perfect reflection, verified via full wave simulations.