摘要
As a kind of two-dimensional transition metal dichalcogenide material, tungsten diselenide(WSe_2) has attracted increasing attention, owing to its gapped electronic structure, relatively high carrier mobility, and valley pseudospin, all of which show its valuable nonlinear optical properties. There are few studies on the nonlinear optical properties of WSe_2 and correlation with its electronic structure. In this paper, the effects of spatial self-phase modulation(SSPM) and distortion influence of WSe_2 ethanol suspensions are systematically studied, namely,the nonlinear refractive index and third-order nonlinear optical effect. We obtained the WSe_2 dispersions SSPM distortion formation mechanism, and through it, we calculated the nonlinear refractive index n_2,nonlinear susceptibility χ^(3), and their wavelength dependence under the excitation of 457 nm, 532 nm, and671 nm lasers. Moreover, by use of its strong and broadband nonlinear optical response, all-optical switching of two different laser beams due to spatial cross-phase modulation has been realized experimentally. Our results are useful for future optical devices, such as all-optical switching and all-optical information conversion.
As a kind of two-dimensional transition metal dichalcogenide material, tungsten diselenide(WSe_2) has attracted increasing attention, owing to its gapped electronic structure, relatively high carrier mobility, and valley pseudospin, all of which show its valuable nonlinear optical properties. There are few studies on the nonlinear optical properties of WSe_2 and correlation with its electronic structure. In this paper, the effects of spatial self-phase modulation(SSPM) and distortion influence of WSe_2 ethanol suspensions are systematically studied, namely,the nonlinear refractive index and third-order nonlinear optical effect. We obtained the WSe_2 dispersions SSPM distortion formation mechanism, and through it, we calculated the nonlinear refractive index n_2,nonlinear susceptibility χ^(3), and their wavelength dependence under the excitation of 457 nm, 532 nm, and671 nm lasers. Moreover, by use of its strong and broadband nonlinear optical response, all-optical switching of two different laser beams due to spatial cross-phase modulation has been realized experimentally. Our results are useful for future optical devices, such as all-optical switching and all-optical information conversion.
基金
National Natural Science Foundation of China(NSFC)(11604216,61505111)
China Postdoctoral Science Foundation(2017M622746,2018M633129)
Natural Science Foundation of Guangdong Province(2018A030313198)
