Part 1: Spatially Dispersive Metasurfaces: Zero Thickness Surface Susceptibilities & Extended GSTCs

TL;DR

This paper introduces a method to model spatially dispersive metasurfaces using explicit angle-dependent susceptibilities, extending GSTCs to account for spatial dispersion with practical examples and numerical validation.

Contribution

It develops a novel framework expressing surface susceptibilities as polynomial ratios, leading to extended GSTCs that incorporate spatial dispersion effects in metasurface modeling.

Findings

Surface susceptibilities expressed as polynomial ratios facilitate spatial derivative formulations.

Extended GSTCs effectively model spatial dispersion in metasurfaces.

Numerical examples confirm the validity of the proposed approach.

Abstract

A simple method to describe spatially dispersive metasurfaces is proposed where the angle-dependent surface susceptibilities are explicitly used to formulate the zero thickness sheet model of practical metasurface structures. It is shown that if the surface susceptibilities of a given metasurface are expressed as a ratio of two polynomials of tangential spatial frequencies, $\boldsymbol{k_{||}}$ with complex coefficients, they can be conveniently expressed as spatial derivatives of the difference and average fields around the metasurface in the space domain, leading to extended forms of the standard Generalized Sheet Transition Conditions (GSTCs) accounting for the spatial dispersion. Using two simple examples of a short electric dipole and an all-dielectric cylindrical puck unit cells, which exhibit purely tangential surface susceptibilities and reciprocal/symmetric transmission and reflection characteristics, the proposed concept is numerically confirmed in 2D. A single Lorentzian has been found to describe the spatio-temporal frequency behavior of a short dipole unit cell, while a multi-Lorentzian description is developed to capture the complex multiple angular resonances of the dielectric puck. For both cases, the appropriate spatial boundary conditions are derived.