Bragg Polaritons: Strong Coupling and Amplification in an Unfolded Microcavity

TL;DR

This paper demonstrates strong coupling of quantum well excitons with photonic crystal Bragg modes in a one-dimensional structure, leading to the formation of Bragg polaritons and their amplification, advancing photonic device research.

Contribution

It introduces the concept of Bragg polaritons formed by exciton-photon coupling in a Bragg structure and demonstrates their amplification, a novel approach in photonic crystal research.

Findings

Strong coupling of excitons to Bragg modes achieved

Observation of Bragg polariton eigenstates

Demonstration of parametric amplification of Bragg polaritons

Abstract

Periodic incorporation of quantum wells inside a one--dimensional Bragg structure is shown to enhance coherent coupling of excitons to the electromagnetic Bloch waves. We demonstrate strong coupling of quantum well excitons to photonic crystal Bragg modes at the edge of the photonic bandgap, which gives rise to mixed Bragg polariton eigenstates. The resulting Bragg polariton branches are in good agreement with the theory and allow demonstration of Bragg polariton parametric amplification.