Ultrafast Nonlinear Optical Response of Two-dimensional MoS_2/Bi_2Te_3 Heterostructure

【Author】

DONG Jun-Hao;PAN Jia;YE Chen-Yu;WANG Ru;HUANG Yong-Feng;ZHENG Jing-Ying;ZHAN Hong-Bing;WANG Qian-Ting;School of Materials Science and Engineering,Fujian University of Technology;Fujian Provincial Key Laboratory of Advanced Materials Processing and Application;School of Electronic,Electrical Engineering and Physics,Fujian University of Technology;College of Materials Science and Engineering,Fuzhou University;

【Institution】

School of Materials Science and Engineering,Fujian University of Technology;Fujian Provincial Key Laboratory of Advanced Materials Processing and Application;School of Electronic,Electrical Engineering and Physics,Fujian University of Technology;College of Materials Science and Engineering,Fuzhou University;

【Abstract】

Controlled stacking of different two-dimensional (2D) atomic layers hold great promise for significantly optimizing the optical properties of 2D materials and broadening their applications.Here,vertical 2DMoS_2/Bi_2Te_3 heterostructures with high crystallinity and optical quality have been successfully constructed,through drop-casting 2D Bi_2Te_3 flakes on chemical vapor deposition (CVD)-grown MoS_2 flakes.Based on our homebuilt micro Z-scan and pump-probe measurement,we precisely investigated and compared the nonlinear optical (NLO)performance of an individual micro-sized MoS_(2 )flake before and after stacking 2D Bi_2Te_(3 )nanoplates.Moreover,layer-dependent ultrafast carrier dynamics of CVD-grown MoS_(2 )flakes were also explored.Owing to the efficient charge transfer from the monolayer (1 L) MoS_2 to 2D Bi_2Te_3,the 1L MoS_2/Bi_2Te_3 heterostructure demonstrated excellent NLO performance with superior nonlinear saturable absorption coefficient and ultrashort carrier lifetime.Our work greatly enriches our understanding of 2D heterostructure and paves the way for designing new type of tunable 2D photonics materials by combining the optical advantages of different 2D materials.

【Keywords】

two-dimensional materials;;nonlinear optics;;ultrafast response

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