MoTe2 quantum dots-based all-optical switching

Abstract In this study, the nonlinear optical response of the MoTe 2 quantum dots (QDs) dispersion was measured by the method of spatial self-phase modulation (SSPM). Using this method, the nonlinear refractive index ( n 2 ) of the MoTe 2 QDs dispersion is calculated to be 3.6569 × 10−5 cm 2W−1 and 1.0288 × 10−5 cm 2W−1 at λ = 457 nm and 532 nm, respectively. Moreover, the relative change of nonlinear refractive index ( Δ n 2 / n 2 ) of the MoTe 2 QDs caused by distortion was discussed. The results show that the value of Δ n 2 / n 2 can be regulated from 0.2 to 0.8 by changing the incident intensity at λ = 457 nm , and the adjustable range of 0.1–0.7 for Δ n 2 / n 2 at λ = 532 nm . Taking advantage of the strong nonlinear effect, we further experimentally design an all-optical switching based on MoTe 2 QDs dispersion that to manipulate a signal light ( λ = 532 nm ) by a controlling light ( λ = 457 nm ) with the method of spatial cross-phase modulation (SXPM). This investigation unambiguously demonstrates that MoTe 2 QDs has potential application in optoelectronic devices, especially in all-optical switching.