Broadband Slow Light Metamaterial Based on a Double-Continuum Fano Resonance

TL;DR

This paper introduces a novel three-dimensional metamaterial with a Double-Continuum Fano resonance that enables broadband slow light propagation with uniform group velocity, surpassing traditional EIT-based methods.

Contribution

The paper presents the concept and implementation of a low-symmetry 3D metamaterial supporting DCF resonance for broadband slow light, demonstrating advantages over EIT-based approaches.

Findings

Achieved broadband slow light with uniform group velocity.

Demonstrated superior spectral performance compared to EIT.

Implemented a specific metamaterial design supporting DCF resonance.

Abstract

We propose a concept of a low-symmetry three-dimensional metamaterial exhibiting a Double- Continuum Fano (DCF) optical resonance. Such metamaterial is described as a birefringent medium supporting a discrete "dark" electromagnetic state weakly coupled to the continua of two nondegen- erate "bright" bands of orthogonal polarizations. It is demonstrated that light propagation through such DCF metamaterial can be slowed down over a broad frequency range when the medium param- eters (e.g. frequency of the "dark" mode) are adiabatically changed along the optical path. Using a specific metamaterial implementation, we demonstrate that the DCF approach to slow light (SL) is superior to that of the EIT because it enables spectrally uniform group velocity and transmission coefficient.