Integrated, ultrafast all-optical polariton transistors

Abstract

All-optical transistors are an auspicious approach that could fuel a new generation of computing architectures. All-optical transistors based on cavity exciton-polaritons in vertical microcavities, utilizing nonlinearity in the strong light-matter interaction regime, have showcased logic gates and sensitivity down to single photon level. However, to scale up the technology an integrated polariton transistor is necessary. Here, we present integrated cavities based on silicon high contrast gratings (HCG) (Fig.1 a and b) with ladder-type conjugated polymer, proposed to support exciton-polaritons, for scalable all-optical logic. By changing the pump intensity, we observe nonlinearity in the emission (Fig. 1 c), and by changing the cavity length (multiple devices) we demonstrate that our structure is within the strong light-matter coupling regime (Fig. 1 d). Furthermore, by coupling multiple HCG cavities we demonstrate ultrafast all-optical transistor.