Construction of Chiral Metamaterial with U-Shaped Resonator Assembly

TL;DR

This paper presents a novel chiral metamaterial design using U-shaped resonators that enables negative refractive index for different circular polarizations at distinct frequencies, advancing tunable electromagnetic applications.

Contribution

It introduces a new chiral metamaterial assembly with dual resonant frequencies, demonstrating polarization-dependent negative refractive index behavior.

Findings

Negative refractive index achieved at specific resonant frequencies for different polarizations

Effective electric and magnetic dipoles are collinear at resonance

Design offers new insights into tuning electromagnetic properties with chiral structures

Abstract

Chiral structure can be applied to construct metamaterial with negative refractive index (NRI). In an assembly of double-layered metallic U-shaped resonators with two resonant frequencies wH and wL, the effective induced electric and magnetic dipoles, which are contributed by the specific surface current distributions, are collinear at the same frequency. Consequently, for left circularly polarized light, NRI occurs at wH, whereas for right circularly polarized light it occurs at wL. Our design provides a new example to apply chiral structures to tune electromagnetic properties, and could be enlightening in exploring chiral metamaterials.