Nonlinear Effects in Multi-Photon Polaritonics

TL;DR

This paper theoretically investigates nonlinear effects in a semiconductor quantum well within a microcavity, focusing on two-photon absorption and its role in inducing optical bistability under coherent pumping.

Contribution

It introduces a detailed calculation of two-photon absorption in a quantum well and demonstrates how this nonlinearity leads to bistability in the emission spectrum.

Findings

Two-photon absorption matrix element calculated.

Bistability observed in emission spectrum under coherent pumping.

Nonlinear effects significantly influence polariton dynamics.

Abstract

We consider theoretically nonlinear effects in a semiconductor quantum well embedded inside a photonic microcavity. Two-photon absorption by a 2p exciton state is considered and investigated; the matrix element of two-photon absorption is calculated. We compute the emission spectrum of the sample and demonstrate that under coherent pumping the nonlinearity of the two photon absorption process gives rise to bistability.