Microcavity polariton-like dispersion doublet in resonant Bragg gratings

TL;DR

This paper demonstrates that one-dimensional Bragg gratings coupled with excitonic media can mimic microcavity polariton dispersion, enabling new nonlinear optical phenomena like slow-light effects and efficient parametric scattering.

Contribution

It introduces the concept of Braggoritons in semiconductor gratings as a novel way to replicate microcavity polariton dispersion.

Findings

Braggoritons exhibit microcavity polariton-like dispersion.

Potential for observing slow-light-enhanced nonlinear effects.

Enables efficient parametric scattering at specific frequencies.

Abstract

Periodic structures resonantly coupled to excitonic media allow the existence of extra intragap modes ('Braggoritons'), due to the coupling between Bragg photon modes and 3D bulk excitons. This induces unique and unexplored dispersive features, which can be tailored by properly designing the photonic bandgap around the exciton resonance. We report that one-dimensional Braggoritons realized with semiconductor gratings have the ability to mimic the dispersion of quantum-well microcavity polaritons. This will allow the observation of new nonlinear phenomena, such as slow-light-enhanced nonlinear propagation and an efficient parametric scattering at two 'magic frequencies'.