Graphene fish-scale array as controllable reflecting photonic structure

TL;DR

This paper introduces a novel graphene-based reflectarray with controllable resonant features, utilizing surface plasmon-polaritons and photonic crystal eigenwaves for tunable reflectivity control.

Contribution

It presents a new graphene fish-scale array structure that exhibits dual resonances, combining plasmonic and photonic effects for advanced reflectarray design.

Findings

Identified two types of sharp reflectivity dips due to different resonances.

Demonstrated control over resonant features via structure design.

Revealed independence of certain resonances from unit cell size.

Abstract

We report resonant features of novel controllable reflectarray which consists of meander-like graphene strips placed on a metal-backed dielectric substrate. The structure manifests two kinds of resonances appeared as sharp deeps of reflectivity. The first one exists because the strips of periodic cells of the structure have resonant sizes for induced surface plasmon-polaritons. The second kind of resonances is defined by excitation of TM eigenwaves of the whole structure as a plane photonic crystal. The latter resonances do not depend on whether the strips of the unit cells have resonant sizes or not.