Anisotropy-induced Fano resonance

TL;DR

This paper reports the discovery of an optical Fano resonance caused by birefringence control, enabling fast-switching radiation and demonstrating robustness against loss and size effects.

Contribution

It introduces a novel birefringence-induced Fano resonance mechanism and reveals the resonance condition, showing its sensitivity and potential for rapid optical switching.

Findings

Birefringence-induced Fano resonance causes fast-switching radiation.

Resonance remains pronounced despite increased loss and size.

Giant switching occurs near surface plasmon resonance due to tiny birefringence perturbations.

Abstract

An optical Fano resonance, which is caused by birefringence control rather than frequency selection, is discovered. Such birefringence-induced Fano resonance comes with fast-switching radiation. The resonance condition $\varepsilon_t< 1/\varepsilon_r$ is revealed and a tiny perturbation in birefringence is found to result in a giant switch in the principal light pole induced near surface plasmon resonance. The loss and size effects upon the Fano resonance have been studied Fano resonance is still pronounced, even if the loss and size of the object increase. The evolutions of the radiation patterns and energy singularities illustrate clearly the sensitive dependence of Fano resonance upon the birefringence.