Two-dimensional (2D) layered transition metal dichalcogenides (TMDCs) exhibit unique nonlinear optical (NLO) features and have becoming intriguing and promising candidate materials for photonic and optoelectronic devices with high performance and unique functions. Owing to layered geometry and the thickness-dependent bandgap, we studied the ultrafast NLO properties of a range of TMDCs. TMDCs with high-quality layered nanosheets were prepared through chemical vapor deposition (CVD) technique and vapor-phase growth method. Saturable absorption, two photon absorption (TPA) and two photon pumped frequency up-converted luminescence were observed from these 2D nanostructures. The exciting results open up the door to 2D photonic devices, such as passive mode-lockers, Q-switchers, optical limiters, light emitters, etc.
Ningning Dong, Saifeng Zhang, Yuanxin Li, and Jun Wang, "Two-photon absorption in layered transition metal dichalcogenides," Proc. SPIE 10529, Organic Photonic Materials and Devices XX, 1052909 (Presented at SPIE OPTO: January 31, 2018; Published: 21 February 2018); https://doi.org/10.1117/12.2288365.
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