Modulation of the second-harmonic generation in MoS2 by graphene covering

• Published in: 中国物理B（英文版） Vol. 30; no. 2; pp. 158 - 164
• Main Authors: Chunchun Wu, Nianze Shang, Zixun Zhao, Zhihong Zhang, Jing Liang, Chang Liu, Yonggang Zuo, Mingchao Ding, Jinhuan Wang, Hao Hong, Jie Xiong, Kaihui Liu
• Format: Journal Article
• Language: English
• Published: State Key Laboratory of Electronic Thin Films and Integrated Devices,University of Electronic Science and Technology of China,Chengdu 610054,China 01.02.2021; 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%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%Institute of Physics,Chinese Academy of Sciences,Beijing 100080,China%State Key Laboratory of Electronic Thin Films and Integrated Devices,University of Electronic Science and Technology of China,Chengdu 610054,China
• Subjects: dielectric screening; two-dimensional materials; second harmonic generation(SHG); graphene
• ISSN: 1674-1056; 2058-3834
• DOI: 10.1088/1674-1056/abd77f

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 imag-ing.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 interfac-ing 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.