Broadband nonlinear photoresponse of 2D titanium disulfide for ultrashort pulse generation and all-optical thresholding devices

Motivated by the outstanding performance of graphene, graphene-like 2D materials have been intensively investigated, such as topological insulators, transition metal dichalcogenides (TMDs) and black phosphorous. Recently, 2D titanium disulfide, a typical TMD, is found to have strong light absorption properties from visible to infrared region, which is highly attractive for applications in nonlinear photonics. Researchers have fabricated a novel saturable absorber device is successfully fabricated based on 2D TiS2 nanosheets for ultrashort pulse generation and all-optical thresholding at the communication band.