Metasurfaces with bound states in the continuum enabled by eliminating first Fourier harmonic component in lattice parameters

TL;DR

This paper introduces Fourier-component-engineered metasurfaces that lack the first Fourier harmonic, enabling the support of high-Q bound states in the continuum near second stop bands, offering a new way to control electromagnetic waves.

Contribution

It presents a novel design of photonic lattices that eliminate the first Fourier harmonic, leading to unique bound states in the continuum.

Findings

Support for continuous high-Q bound states near second stop bands.

Demonstration of electromagnetic wave manipulation through Fourier harmonic engineering.

Introduction of a new method to design photonic lattices with tailored properties.

Abstract

Conventional photonic lattices, such as metamaterials and photonic crystals, exhibit various interesting physical properties that are attributed to periodic modulations in lattice parameters. In this study, we introduce novel types of photonic lattices, namely Fourier-component-engineered metasurfaces, that do not possess the first Fourier harmonic component in the lattice parameters. We demonstrate that these metasurfaces support the continuous high-$Q$ bound states near second stop bands. The concept of engineering Fourier harmonic components in periodic modulations provides a new method to manipulate electromagnetic waves in artificial periodic structures.