Synthesis of Electromagnetic Metasurfaces: Principles and Illustrations

TL;DR

This paper reviews the mathematical synthesis and physical realization of metasurfaces, illustrating their capabilities through various examples including polarization control, switching, non-reciprocity, and dielectric engineering.

Contribution

It provides a comprehensive overview of synthesis methods and realization techniques for metasurfaces, introducing novel designs like transistor and non-reciprocal metasurfaces.

Findings

Demonstrated polarization beam splitting and orbital angular momentum multiplexing.

Introduced a linear switch based on destructive interference.

Presented non-reciprocal and all-dielectric metasurface designs.

Abstract

The paper presents partial overview of the mathematical synthesis and the physical realization of metasurfaces, and related illustrative examples. The synthesis consists in determining the exact tensorial surface susceptibility functions of the metasurface, based on generalized sheet transition conditions, while the realization deals with both metallic and dielectric scattering particle structures. The examples demonstrate the capabilities of the synthesis and realization techniques, thereby showing the plethora of possible metasurface field transmission and subsequent applications. The first example is the design of two diffraction engineering birefringent metasurfaces performing polarization beam splitting and orbital angular momentum multiplexing, respectively. Next, we discuss the concept of the "transistor" metasurface, which is an electromagnetic linear switch based on destructive interferences. Then, we introduce a non-reciprocal non-gyrotropic metasurface using a pick-up circuit radiator (PCR) architecture. Finally, the implementation of all-dielectric metasurfaces for spatial dispersion engineering is discussed.