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.
Highlights
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
The fabrication of 2D heterostructures or nanocomposites assembled by graphene and other graphene-like 2D crystals has been demonstrated as a useful strategy for the realization of novel 2D materials with unique electronic and optoelectronic applications[30,31]
The transmission electron microscope (TEM) image of MoS2/graphene nanocomposites (Fig. 1(b)) reveals a general trend with regard to the sheets of MoS2 homogeneously loaded on graphene
Summary
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. Enlightened by the substantial advantages of graphene for optoelectronics, researchers have started to explore the graphene analogues of layered inorganic materials Another type of 2D materials are transition metal dichalcogenides (TMDCs), such as MoS2, MoSe2, WS2 and WSe2, consisting of a hexagonal layer of metal atoms (M) sandwiched between two layers of chalcogen atoms (X) within the stoichiometry MX212. We have further studied the nonlinear absorption through the open aperture Z-scan system from the visible (400 nm) to the near-infrared (1560 nm) broadband frequency range These findings suggest that MoS2/graphene nanocomposites could potentially be used as a passive Q-switcher and mode-locker in ultrafast lasers and ultrafast optical switches. The use of these materials has led to the generation of ultrashort pulse with improved performance
Sign-in/Register to view highlights & summary Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
