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Chin. Phys. B, 2022, Vol. 31(9): 097304    DOI: 10.1088/1674-1056/ac6db4

Optical second-harmonic generation of Janus MoSSe monolayer

Ce Bian(边策)1,2, Jianwei Shi(史建伟)3,4, Xinfeng Liu(刘新风)3,4, Yang Yang(杨洋)1, Haitao Yang(杨海涛)1,2,5,†, and Hongjun Gao(高鸿钧)1,2,5
1 Beijing National Laboratory for Condensed Matter Physics and Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China;
2 School of Physical Sciences, University of Chinese Academy of Sciences, Chinese Academy of Sciences, Beijing 100190, China;
3 CAS Key Laboratory of Standardization and Measurement for Nanotechnology and CAS Center for Excellence in Nanoscience, National Center for Nanoscience and Technology, Beijing 100190, China;
4 School of Nanoscience and Technology, University of Chinese Academy of Sciences, Beijing 100049, China;
5 Songshan Lake Materials Laboratory, Dongguan 523808, China
Abstract  The transition metal dichalcogenides (TMD) monolayers have shown strong second-harmonic generation (SHG) owing to their lack of inversion symmetry. These ultrathin layers then serve as the frequency converters that can be intergraded on a chip. Here, taking MoSSe as an example, we report the first detailed experimental study of the SHG of Janus TMD monolayer, in which the transition metal layer is sandwiched by the two distinct chalcogen layers. It is shown that the SHG effectively arises from an in-plane second-harmonic polarization under paraxial focusing and detection. Based on this, the orientation-resolved SHG spectroscopy is realized to readily determine the zigzag and armchair axes of the Janus crystal with an accuracy better than ±0.6°. Moreover, the SHG intensity is wavelength-dependent and can be greatly enhanced (~ 60 times) when the two-photon transition is resonant with the C-exciton state. Our findings uncover the SHG properties of Janus MoSSe monolayer, therefore lay the basis for its integrated frequency-doubling applications.
Keywords:  Janus MoSSe monolayer      second-harmonic generation (SHG)      orientation-resolved spectroscopy      C-exciton resonance  
Received:  10 March 2022      Revised:  23 April 2022      Accepted manuscript online:  07 May 2022
PACS:  73.63.Bd (Nanocrystalline materials)  
  42.70.Mp (Nonlinear optical crystals)  
  42.65.Ky (Frequency conversion; harmonic generation, including higher-order harmonic generation)  
  42.79.Nv (Optical frequency converters)  
Fund: We thank Wanghua Wu and Yiyang Gong for the assistance with SHG measurements. This work was supported by the National Natural Science Foundation of China (Grant Nos. 61888102, 51771224, and 62175253), the National Key R&D Program of China (Grant Nos. 2018YFA0305803 and 2019YFA0308501), and the Chinese Academy of Sciences (Grant Nos. XDB33030100 and XDB30010000). J. S. and X. L. thank the supports from the National Natural Science Foundation of China (Grant Nos. 20173025, 22073022, and 11874130), the National Key R&D Program of China (Grant No. 2017YFA0205004), the Chinese Academy of Sciences (Grant Nos. XDB36000000 and Y950291), and the DNL Cooperation Fund (Grant No. DNL202016).
Corresponding Authors:  Haitao Yang     E-mail:

Cite this article: 

Ce Bian(边策), Jianwei Shi(史建伟), Xinfeng Liu(刘新风), Yang Yang(杨洋), Haitao Yang(杨海涛), and Hongjun Gao(高鸿钧) Optical second-harmonic generation of Janus MoSSe monolayer 2022 Chin. Phys. B 31 097304

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