EIT-like transmission by interaction between multiple Bragg scattering and local plasmonic resonances

TL;DR

This paper investigates how interactions between multiple Bragg scattering and local plasmonic resonances can produce EIT-like transmission effects in periodic resonator-waveguide systems, with potential applications in optical control.

Contribution

It introduces a method to tune the interaction between Bragg scattering and local resonances to achieve EIT-like phenomena, supported by theoretical and numerical analysis.

Findings

EIT-like effects can be achieved through interaction tuning.

Metal Joule loss can suppress interference effects.

Total absorption increases near transparency windows.

Abstract

We study the optical properties associated to both the polariton gap and the Bragg gap in periodic resonator-waveguide coupled system, based on the temporal coupled mode theory and the transfer matrix method. By the complex band and the transmission spectrum, it is feasible to tune the interaction between multiple Bragg scattering and the local resonance, which may give rise to analogous phenomena of electromagnetically induced transparency (EIT). We further design a plasmonic slot waveguide side-coupled with local plasmonic resonator to demonstrate the EIT-like effects in the near-infared band. Numerical calculations show that realistic amount of metal Joule loss may destroy the interference and the total absorption is enhanced in the transparency windwo due to the near zero group velocity of the guiding wave.