Photonics Research, 2020, 8 (11): 11001725, Published Online: Oct. 28, 2020  

Revealing the intrinsic nonlinear optical response of a single MoS2 nanosheet in a suspension based on spatial self-phase modulation Download: 654次

Author Affiliations
1 Hunan Key Laboratory for Super-microstructure and Ultrafast Process, School of Physics and Electronics, Central South University, Changsha 410083, China
2 e-mail: junhe@csu.edu.cn
3 e-mail: wyw1988@csu.edu.cn
Abstract
The reorientation of 2D materials caused by nonlocal electron coherence is the formation mechanism of 2D material spatial self-phase modulation under laser irradiation, which is widely known as the “wind-chime” model. Here, we present a method that provides strong evidence for the reorientation of 2D-material-induced spatial self-phase modulation. The traditional “wind-chime” model was modified by taking into account the attenuation, i.e., damping of the incident light beam in the direction of the optical path. Accordingly, we can extract the nonlinear refractive index of a single MoS2 nanosheet, instead of simply obtaining the index from an equivalent MoS2 film that was constructed by all nanosheets. Our approach introduces a universal and accurate method to extract intrinsic nonlinear optical parameters from 2D material systems.

Si Xiao, Ying Ma, Yilin He, Yiduo Wang, Hao Xin, Qi Fan, Jingdi Zhang, Xiaohong Li, Yu Zhang, Jun He, Yingwei Wang. Revealing the intrinsic nonlinear optical response of a single MoS2 nanosheet in a suspension based on spatial self-phase modulation[J]. Photonics Research, 2020, 8(11): 11001725.

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