Liquid-Exfoliated Few-Layer InSe Nanosheets for Broadband Nonlinear All-Optical Applications

摘要

The nonlinear optical response of 2D materials has attracted wide attention in the recent year due to their strong nonlinearity and broadband characteristics. A new optical scheme is presented enabling the implementation of the broadband nonlinear optical response and their all-optical applications of few-layered InSe nanosheets. First, few-layer InSe nanosheets are synthesized by using the liquid-phase exfoliated method; then the third-order nonlinear susceptibility is measured with the spatial self-phase modulation. Based on the obtained nonlinear optical response, a method is proposed for forming a nonreciprocal propagation photonic diode based on a mixed structure of InSe/C3N4. In addition, through the cross-phase modulation of the two beams, the all-optical switches and all-optical information conversion have also been discussed. The implementations of these few-layered InSe-based all-optical devices show that the layered InSe is indeed an excellent candidate for use in future all-optical photonic circuits as an optical diode and optical switching.