Low-threshold power and tunable integrated optical limiter based on an ultracompact VO₂/Si waveguide

Optical limiters are nonlinear devices that encompass applications from device protection to activation functionalities in neural networks. In this work, we report an optical limiter on silicon photonics based ultracompact VO2/Si waveguide. Our 20-?m-long experimental features a thermal tunable threshold power of only ?3.5 mW while being spectrally broadband. work provides new pathway achieve integrated for dense and low-power photonic circuits.