The Fano and EIT-like resonance characteristic of asymmetric double micro-ring resonator

TL;DR

This paper investigates how breaking symmetry in a double micro-ring resonator creates Fano and EIT-like resonances, which can be independently tuned for advanced optical applications.

Contribution

It reveals the formation mechanisms and tunability of Fano and EIT-like resonances in asymmetric double micro-ring resonators, highlighting their low loss and high localization features.

Findings

Fano resonance exhibits an asymmetric, sharp peak tunable by asymmetric coupling.

EIT-like transmission can be tuned via absorption and phase shift factors.

Resonances show low loss and high near-field localization.

Abstract

By breaking the symmetrical arrangement of double micro-ring resonator, the formation mechanism and performance of reflection and transmission spectrum and optical field distribution are investigated. The reflection spectrum is Fano shape. The Fano resonance has an asymmetric and sharp resonance peak can be independently tuned by changing the asymmetric coupling factor of the first micro-ring. The transmission spectrum is electromagnetically induced transparency(EIT)-like shape. The (EIT)-like resonance can be independently tuned by changing the absorption factor and the phase shift factor of the second micro-ring. The Fano and EIT-like resonance have low loss and high near-field localization characteristics, our research has promising applications in optical communication and opto-electronic modulators.