Microfluidic-Assisted Growth of Perovskite Microwires for Room-Temperature All-Optical Switching Based on Total Internal Reflection.

The development of efficient integrated photonic circuits is fundamental for ongoing research in information processing and computer science. The greatest challenge facing photonic systems is achieving strong nonlinearities, which are exploitable in strongly coupled systems, leading to the formation of exciton-polaritons. In this context, the use of hybrid organic-inorganic perovskites (PVKs) offers a promising alternative, exhibiting robust interactions at Room Temperature (RT). However, the development of PVK-based integrated devices requires both the ability to achieve long in-plane propagation and the development of alternative fabrication approaches tailored to PVK materials, designed to preserve their optical properties and prevent degradation. Herein, we present the realization of a proof-of-concept all-optical switch using propagating polaritons confined in Total Internal Reflection (TIR), which ensures long in-plane propagation and limited optical losses. We realized efficient injection-extraction of the TIR-confined waveguide polariton modes by employing gold grating couplers prepatterned on the substrate.