Anisotropic metallic metasurface superlattices supporting Fano resonances and bound states in the continuum

TL;DR

This paper introduces metallic metasurface superlattices with multiple slits that support Fano resonances and bound states in the continuum, enabling advanced control of electromagnetic waves across various wavelengths.

Contribution

It demonstrates the design and analysis of anisotropic metallic superlattices supporting complex resonances, a novel approach for wave manipulation.

Findings

Number of resonances depends on the number of slits in the superlattice

Superlattices support Fano resonances and bound states in the continuum

Mechanisms applicable from microwave to far-infrared wavelengths

Abstract

A perfect metal film with a periodic arrangement of cut-through slits, an anisotropic metallic metamaterial film, mimics a dielectric slab and supports guided electromagnetic waves in the direction perpendicular to the slits. Here, we introduce metallic metasurface superlattices that include multiple slits in a period, and demonstrate that the superlattices support the Fano resonances and bound states in the continuum. The number of Fano resonances and bound states depend on the number of slits in a period of superlattices. The metallic metasurface superlattices provide new mechanisms to manipulate electromagnetic waves, ranging from microwave to far-infrared wavelengths, where a conventional metal can be considered as a perfect electric conductor.