Enhanced four-wave mixing process near the excitonic resonances of bulk MoS_2

作     者：BRIAN A.KO ALEXEI V.SOKOLOV MARLAN O.SCULLY ZHENRONG ZHANG HO WAI HOWARD LEE 

作者机构：Department of Physics Baylor University The Institute for Quantum Science and Engineering Texas A&M University College Station Princeton UniversityPrinceton 

出 版 物：《Photonics Research》 (光子学研究（英文版）)

年 卷 期：2019年第7卷第3期

页      面：251-259页

核心收录：

学科分类：0808[工学-电气工程] 0809[工学-电子科学与技术（可授工学、理学学位）] 07[理学] 0805[工学-材料科学与工程（可授工学、理学学位）] 0702[理学-物理学] 

基　　金：National Science Foundation(NSF)(CHE-1609608) Welch Foundation(A-1261,AA-1956-20180324,A-1547) Baylor University(Baylor) Office of Naval Research(ONR)(N00014-16-1-2578) 

主　　题：Two-dimensional materials excitonic resonances MoS2 

摘      要：Two-dimensional materials are generating great interest due to their unique electrical and optical *** 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.