Resonance tunneling of polaritons in 1-D chain with a single defect

TL;DR

This paper investigates how a single defect in a 1-D dipole chain enables resonance tunneling of polaritons within a forbidden band, revealing the role of local polariton states induced by the defect.

Contribution

It introduces the concept of resonance tunneling of polaritons caused by a microscopic defect in a 1-D chain, highlighting the formation of local polariton states.

Findings

Resonance tunneling occurs within the forbidden band due to a defect.

Local polariton states are responsible for the tunneling effect.

The defect acts as a resonant impurity enabling wave transmission.

Abstract

We consider propagation of coupled waves (polaritons) formed by a scalar electromagnetic wave and excitations of a finite one dimensional chain of dipoles. It is shown that a microscopic defect (an impurity dipole) embedded in the chain causes resonance tunneling of the electromagnetic wave with the frequency within the forbidden band between two polariton branches. We demonstrate that resonance tunneling occurs due to local polariton states caused by the defect.