title: Broadband and enhanced nonlinear optical response of MoS2/graphene nanocomposites for ultrafast photonics applications.
abstract: Due to their relatively high compatibility with specific photonic structures, strong light-matter interactions and unique nonlinear optical response, two-dimensional (2D) materials, such as graphene and transition metal dichalcogenides, are attractive for ultrafast photonics applications. Here, we fabricate MoS2/graphene nanocomposites by a typical hydrothermal method. In addition, we systematically investigate their nonlinear optical responses. Our experiments indicate that the combined advantages of ultrafast relaxation, a broadband response from graphene, and the strong light-matter interaction from MoS2, can be integrated together by composition. The optical properties in terms of carrier relaxation dynamics, saturation intensity and modulation depth suggest great potential for the MoS2/graphene nanocomposites in photonics applications. We have further fabricated 2D nanocomposites based optical saturable absorbers and integrated them into a 1.5 μm Erbium-doped fiber laser to demonstrate Q-switched and mode-locked pulse generation. The fabrication of 2D nanocomposites assembled from different types of 2D materials, via this simple and scalable growth approach, paves the way for the formation and tuning of new 2D materials with desirable photonic properties and applications.
authors.affiliation: Key Laboratory for Micro-/Nano-Optoelectronic Devices of Ministry of Education, School of Physics and Electronics, Hunan University, Changsha 410082, China.
authors.forename: Yaqin
authors.initials: Y
authors.lastname: Jiang
authors.affiliation: Key Laboratory for Micro-/Nano-Optoelectronic Devices of Ministry of Education, School of Physics and Electronics, Hunan University, Changsha 410082, China.
authors.forename: Lili
authors.initials: L
authors.lastname: Miao
authors.affiliation: Key Laboratory for Micro-/Nano-Optoelectronic Devices of Ministry of Education, School of Physics and Electronics, Hunan University, Changsha 410082, China.
authors.forename: Guobao
authors.initials: G
authors.lastname: Jiang
authors.affiliation: SZU-NUS Collaborative Innovation Center for Optoelectronic Science &Technology, Shenzhen University, Shenzhen 518060, China.|Key Laboratory of Optoelectronic Devices and Systems of Ministry of Education and Guangdong Province, Shenzhen University, Shenzhen 518060, China.
authors.forename: Yu
authors.initials: Y
authors.lastname: Chen
authors.affiliation: Hunan Provincial Key Laboratory of Micro-Nano Energy Materials and Devices, Laboratory for Quantum Engineering and Micro-Nano Energy Technology, Xiangtan University, Hunan 411105, China.
authors.forename: Xiang
authors.initials: X
authors.lastname: Qi
authors.affiliation: State Key Laboratory of luminescent Materials and Devices, South China University of Technology, Guangzhou 510000, China.
authors.forename: Xiao-fang
authors.initials: XF
authors.lastname: Jiang
authors.affiliation: Key Laboratory for Micro-/Nano-Optoelectronic Devices of Ministry of Education, School of Physics and Electronics, Hunan University, Changsha 410082, China.|SZU-NUS Collaborative Innovation Center for Optoelectronic Science &Technology, Shenzhen University, Shenzhen 518060, China.|Key Laboratory of Optoelectronic Devices and Systems of Ministry of Education and Guangdong Province, Shenzhen University, Shenzhen 518060, China.
authors.forename: Han
authors.initials: H
authors.lastname: Zhang
authors.affiliation: Key Laboratory for Micro-/Nano-Optoelectronic Devices of Ministry of Education, School of Physics and Electronics, Hunan University, Changsha 410082, China.
authors.forename: Shuangchun
authors.initials: S
authors.lastname: Wen