Controlling Microring Resonator Extinction Ratio via Metal‐Halide Perovskite Nonlinearity

The exceptionally high optical nonlinearities, wide bandgap, and homogeneity in solution-processed metal-halide perovskite media are utilized as nonlinear elements on a silicon photonic platform for low-power-active components, such all-optical switches, modulators, lasers. With room temperature back-end-of-line compatible processing, hybrid (CH3NH3PbI3) microring resonator (MRR) structure is fabricated foundry-processed low-loss platform. in-plane excitation near the light intensity of 110 W m−2, strong two-photon absorption free-carrier saturation observed. 103 field enhancements by MRRs, photorefractive effect reduces linear absorption, represented 102 improvement MRR's intrinsic quality factor 20 dB enhancement extinction ratio.