Photonics Research, 2019, 7 (3): 03000251, Published Online: Feb. 20, 2019
Enhanced four-wave mixing process near the excitonic resonances of bulk MoS2
Abstract
Two-dimensional materials are generating great interest due to their unique electrical and optical properties. In particular, transition metal dichalcogenides such as molybdenum disulfide (MoS 2 ) are attractive materials due to the existence of a direct band gap in the monolayer limit that can be used to enhance nonlinear optical phenomena, such as Raman spectroscopy. Here, we have investigated four-wave mixing processes in bulk MoS 2 using a multiplex coherent anti-Stokes Raman spectroscopy setup. The observed four-wave mixing signal has a resonance at approximately 680 nm, corresponding to the energy of the A excitonic transition of MoS 2 . This resonance can be attributed to the increased third-order nonlinear susceptibility at wavelengths near the excitonic transition. This phenomenon could open the path to using MoS 2 as a substrate for enhancing four-wave mixing processes such as coherent anti-Stokes Raman spectroscopy.
Brian A. Ko, Alexei V. Sokolov, Marlan O. Scully, Zhenrong Zhang, Ho Wai Howard Lee. Enhanced four-wave mixing process near the excitonic resonances of bulk MoS2[J]. Photonics Research, 2019, 7(3): 03000251.