Broadband dispersionless polarization rotation with composite chiral metamaterials

TL;DR

This paper introduces a novel composite chiral metamaterial that achieves broadband, dispersionless polarization rotation with high transmission and low ellipticity, surpassing traditional designs in performance.

Contribution

The study presents a new planar CCMM design with enhanced polarization rotation power and bandwidth, operating losslessly in off-resonance frequencies.

Findings

Achieves flat polarization rotation with high transmission

Operates in a broad, dispersionless frequency range

Outperforms pure chiral metamaterials in rotation power and bandwidth

Abstract

We propose a planar composite chiral metamaterial (CCMM) by symmetrically inserting a metallic mesh between two layers of conjugated gammadion resonators. As the elaborate CCMM operates in the frequency region of off-resonance, it therefore presents loss-less and dispersion-free features. It can achieve flat polarization rotation simultaneously accompanied with high transmission and extremely low ellipticity in a broad bandwidth. In the meanwhile, this intriguing CCMM shows more superiorities in polarization rotation power and operating bandwidth than the pure chiral metamaterial just composed of conjugated gammadions. Due to the fascinating properties, the proposed CCMM is greatly appealing for controlling the polarization state of the electromagnetic waves.