Polarization rotation by an rf-SQUID metasurface

TL;DR

This paper investigates how a two-dimensional array of rf-SQUIDs affects electromagnetic wave transmission, reflection, and polarization rotation, revealing strong resonances influenced by the array's parameters and incident angle.

Contribution

It develops a theoretical model for the electromagnetic response of rf-SQUID metasurfaces, including reflection, transmission, and polarization effects, with analytical expressions for these coefficients.

Findings

Reflection and transmission exhibit strong resonance peaks.

Reflected wave polarization depends solely on split-ring orientation.

Resonance strength varies with incident angle.

Abstract

We study the transmission and reflection of a plane electromagnetic wave through a two dimensional array of rf-SQUIDs. The basic equations describing the amplitudes of the magnetic field and current in the split-ring resonators are developed. These yield in the linear approximation the reflection and transmission coefficients. The polarization of the reflected wave is independent of the frequency of the incident wave and of its polarization; it is defined only by the orientation of the split-ring. The reflection and transmission coefficients have a strong resonance that is determined by the parameters of the rf-SQUID; its strength depends essentially on the incident angle.