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Chin. Phys. B, 2021, Vol. 30(2): 027803    DOI: 10.1088/1674-1056/abd77f
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Modulation of the second-harmonic generation in MoS2 by graphene covering

Chunchun Wu(吴春春)1,2,†, Nianze Shang(尚念泽)2,†, Zixun Zhao(赵子荀)2,†, Zhihong Zhang(张智宏)2, Jing Liang(梁晶)2, Chang Liu(刘畅)2, Yonggang Zuo(左勇刚)3, Mingchao Ding(丁铭超)3, Jinhuan Wang(王金焕)2, Hao Hong(洪浩)2,‡, Jie Xiong(熊杰)1,§, and Kaihui Liu(刘开辉)2,
1 State Key Laboratory of Electronic Thin Films and Integrated Devices, University of Electronic Science and Technology of China, Chengdu 610054, China; 2 State Key Laboratory for Mesoscopic Physics and Frontiers Science Center for Nano-optoelectronics, Collaborative Innovation Center of Quantum Matter, Academy of Advanced Interdisciplinary Studies, School of Physics, Peking University, Beijing 100871, China; 3 Institute of Physics, Chinese Academy of Sciences, Beijing 100080, China
Abstract  Nonlinear optical frequency mixing, which describes new frequencies generation by exciting nonlinear materials with intense light field, has drawn vast interests in the field of photonic devices, material characterization, and optical imaging. Investigating and manipulating the nonlinear optical response of target materials lead us to reveal hidden physics and develop applications in optical devices. Here, we report the realization of facile manipulation of nonlinear optical responses in the example system of MoS2 monolayer by van der Waals interfacial engineering. We found that, the interfacing of monolayer graphene will weaken the exciton oscillator strength in MoS2 monolayer and correspondingly suppress the second harmonic generation (SHG) intensity to 30% under band-gap resonance excitation. While with off-resonance excitation, the SHG intensity would enhance up to 130%, which is conjectured to be induced by the interlayer excitation between MoS2 and graphene. Our investigation provides an effective method for controlling nonlinear optical properties of two-dimensional materials and therefore facilitates their future applications in optoelectronic and photonic devices.
Keywords:  two-dimensional materials      second harmonic generation (SHG)      graphene      dielectric screening  
Published:  26 January 2021
PACS:  78.67.Wj (Optical properties of graphene)  
  42.65.-k (Nonlinear optics)  
Fund: Project supported by Beijing Natural Science Foundation, China (Grant No. JQ19004), Beijing Excellent Talents Training Support, China (Grant No. 2017000026833ZK11), the National Natural Science Foundation of China (Grant Nos. 52025023, 51991340, and 51991342), the National Key Research and Development Program of China (Grant Nos. 2016YFA0300903 and 2016YFA0300804), the Key R&D Program of Guangdong Province, China (Grant Nos. 2019B010931001, 2020B010189001, 2018B010109009, and 2018B030327001), the Beijing Municipal Science & Technology Commission, China (Grant No. Z191100007219005), the Beijing Graphene Innovation Program (Grant No. Z181100004818003), Bureau of Industry and Information Technology of Shenzhen (Graphene platform 201901161512), Guangdong Innovative and Entrepreneurial Research Team Program (Grant No. 2016ZT06D348), the Science, Technology and Innovation Commission of Shenzhen Municipality (Grant No. KYTDPT20181011104202253), and the China Postdoctoral Science Foundation (Grant No. 2020M680177).
Corresponding Authors:  These authors contributed equally to this work. Corresponding author. E-mail: haohong@pku.edu.cn §Corresponding author. E-mail: jiexiong@uestc.edu.cn Corresponding author. E-mail: khliu@pku.edu.cn   

Cite this article: 

Chunchun Wu(吴春春), Nianze Shang(尚念泽), Zixun Zhao(赵子荀), Zhihong Zhang(张智宏), Jing Liang(梁晶), Chang Liu(刘畅), Yonggang Zuo(左勇刚), Mingchao Ding(丁铭超), Jinhuan Wang(王金焕), Hao Hong(洪浩), Jie Xiong(熊杰), and Kaihui Liu(刘开辉) Modulation of the second-harmonic generation in MoS2 by graphene covering 2021 Chin. Phys. B 30 027803

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