Light-induced transition between the strong and weak coupling regimes in planar waveguide with GaAs/AlGaAs quantum well

Abstract

Exciton-polaritons in planar waveguides are of great interest for application in polariton circuits due to the large polariton group velocity in the plane of the waveguide. We demonstrate the ability to control the exciton-polariton coupling by light in an AlGaAs-based planar waveguide with GaAs/AlGaAs quantum well. The transition between strong and weak coupling regimes observed with increasing light intensity is explained by the increase in exciton mode losses due to the quantum well charging. This assumption is confirmed by the reflection spectroscopy with resonant illumination.

Strong coupling regime and hybrid quasinormal modes of a single plasmonic resonator coupled to a TMDC monolayer

“…To date, almost all works to describe strong coupling between TMDCs and MNPs in the literature use this simple coupled oscillator model for explaining experimental data, with reasonably good success in fitting the locations of the eigenfrequencies [11][12][13][37][38][39][40][41]. For example, the coupled oscillator model was used to describe the strong coupling behavior between WSe 2 and a gold bipyramid MNP [13]; the work explored the coupling as a function of number of TMDC layers, which resulted in a saturation of coupling as the number of layers increased.…”

Exciton-polariton dispersion in an A III B V total internal reflection planar waveguide with a quantum well

“…These kind of structures require much less layers to be constructed of and exhibit strong exciton-photon coupling with coupling strengths similar to those of conventional high Q-factor microcavities [13]. Initially, waveguide polaritons were approached in terms of evanescent field coupling to an exciton of a quantum well located outside the waveguiding layer [14,15] and later were studied in systems with QWs within waveguiding layers [13,16,17], e.g. revealing such non-linear phenomena as dark-bright spatio-temporal polariton solitons [18,19].…”