In this paper, we see a strong effect of the injected current on the light emission from the polariton condensate in an n-i-n structure, when we monitor the luminescence intensity under applied bias at various pump powers. We present here three thresholds for nonlinear increase of the intensity. We show that small changes of the incoherent injected current lead to stimulated enhancement of the coherent light emission from free carriers. We conclude that the polariton condensatecurrent system is a highly nonlinear electro-optical system.
Exciton-polariton systems were demonstrated as a medium for all-optical switching independently by several groups in 2012 and 2013. The polariton system is promising for such an application due to its strong nonlinearities and potentially low threshold densities. The photonic component of the polariton enables long-range motion and low losses. We review reports on several different techniques for polariton optical switching, and discuss how these depend on the high density effects in microcavity polaritons.