3 years ago

Large-Area and Highly Crystalline MoSe2 for Optical Modulator.

Wenfei Zhang, Wen-Jun Liu, Irene Ling Li, Jinde Yin, Shuang Chen Ruan, Hao Chen, Peiguang Yan, Jinzhang Wang, Wei Lu, Min Zhang, Zihan Xu, Mengli Liu
Transition metal dichalcogenides (TMDs) have been successfully used as broadband optical modulator materials for pulsed fiber laser systems. However, the nonlinear optical absorptions of exfoliated TMDs are strongly limited by their nanoflakes morphology with uncontrollable lateral size and thickness. In this work, we provide an effective method to fully explore the nonlinear optical properties of MoSe2. Large-area and high quality lattice MoSe2 grown by chemical vapor deposition method was adopted as an optical modulator for the first time. The large-are MoSe2 shows excellent nonlinear optical absorption with a large modulation depth of 21.7% and small saturable intensity of 9.4 MW·cm-2. After incorporated the MoSe2 optical modulator into fiber laser cavity as a saturable absorber, a highly stable Q-switching operation with single pulse energy of 224 nJ is achieved. The large-area MoSe2 possessing superior nonlinear optical properties compared to exfoliated nanoflakes affords possibility for the larger-area two-dimensional materials family as high performance optical devices.

Publisher URL: http://doi.org/10.1088/1361-6528/aa9535

DOI: 10.1088/1361-6528/aa9535

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