MoTe2 quantum dots-based all-optical switching

In this study, the nonlinear optical response of the MoTe2 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 MoTe2 QDs dispersion is calculated to be 3.6569 x 10(-5) cm(2)W(-1) and 1.0288 x 10(-5) cm(2)W(-1) at lambda = 457 nm and 532 nm, respectively. Moreover, the relative change of nonlinear refractive index (Delta n(2)/n(2)) of the MoTe2 QDs caused by distortion was discussed. The results show that the value of Delta n(2)/n(2) can be regulated from 0.2 to 0.8 by changing the incident intensity at lambda = 457 nm, and the adjustable range of 0.1-0.7 for Delta n(2)/n(2) at lambda = 532 nm. Taking advantage of the strong nonlinear effect, we further experimentally design an all-optical switching based on MoTe2 QDs dispersion that to manipulate a signal light (lambda = 532 nm) by a controlling light (lambda = 457 nm) with the method of spatial cross-phase modulation (SXPM). This investigation unambiguously demonstrates that MoTe2 QDs has potential application in optoelectronic devices, especially in all-optical switching.