Generalized Brewster Effect using Bianisotropic Metasurfaces

TL;DR

This paper introduces a bianisotropic metasurface design that achieves reflectionless transmission at any angle and polarization, enabling advanced control over light-matter interactions and improving optical device performance.

Contribution

It provides a rigorous theoretical framework and practical design for generalized Brewster effect using bianisotropic metasurfaces, expanding control over reflection and transmission.

Findings

Achieves reflectionless transmission at arbitrary angles and polarizations.

Provides a design methodology based on GSTCs for metasurfaces.

Enables on-demand manipulation of Fresnel coefficients.

Abstract

We show that a properly designed bianisotropic metasurface placed at the interface between two arbitrary different media, or coating a dielectric medium exposed to the air, provides Brewster (reflectionless) transmission at arbitrary angles and for both the TM and TE polarizations. We present a rigorous derivation of the corresponding surface susceptibility tensors based on the Generalized Sheet Transition Conditions (GSTCs), and demonstrate the system with planar microwave metasurfaces designed for polarization-independent and azimuth-independent operations. Moreover, we reveal that such a system leads to the concept of effective refractive media with engineerable impedance. The proposed bianisotropic metasurfaces provide deeply subwavelength matching solutions for initially mismatched media, and alternatively lead to the possibility of on-demand manipulation of the conventional Fresnel coefficients. The reported generalized Brewster effect represents a fundamental advance in optical technology, where it may both improve the performance of conventional components and enable the development of novel devices.