| ELECTROMAGNETISM, OPTICS, ACOUSTICS, HEAT TRANSFER, CLASSICAL MECHANICS, AND FLUID DYNAMICS |
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Enhancement of the second harmonic generation from monolayer WS2 coupled with a silica microsphere |
| Xiao-Zhuo Qi(祁晓卓)1,2, and Xi-Feng Ren(任希锋)1,2,† |
1. CAS Key Laboratory of Quantum Information, University of Science and Technology of China, Hefei 230026, China;
2. CAS Synergetic Innovation Center of Quantum Information and Quantum Physics, University of Science and Technology of China, Hefei 230026, China |
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Abstract Monolayer transition metal dichalcogenides (TMDs) are widely used for integrated optical and photoelectric devices. Owing to their broken inversion symmetry, monolayer TMDs have a large second-order optical nonlinearity. However, the optical second-order nonlinear conversion efficiency of monolayer TMDs is still limited by the interaction length. In this work, we theoretically study the second harmonic generation (SHG) from monolayer tungsten sulfide (WS2) enhanced by a silica microsphere cavity. By tuning the position, size, and crystal orientation of the material, second-order nonlinear coupling can occur between the fundamental pump mode and different second harmonic cavity modes, and we obtain an optimal SHG conversion efficiency with orders of magnitude enhancement. Our work demonstrates that the microsphere cavity can significantly enhance SHG from monolayer 2D materials under flexible conditions.
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Received: 01 March 2022
Revised: 11 April 2022
Accepted manuscript online:
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PACS:
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42.82.-m
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(Integrated optics)
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42.65.Ky
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(Frequency conversion; harmonic generation, including higher-order harmonic generation)
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| Fund: Project supported by the National Natural Science Foundation of China (Grant Nos. 11774333 and 62061160487) and the Fundamental Research Funds for the Central Universities. |
Corresponding Authors:
Xi-Feng Ren
E-mail: renxf@ustc.edu.cn
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Cite this article:
Xiao-Zhuo Qi(祁晓卓), and Xi-Feng Ren(任希锋) Enhancement of the second harmonic generation from monolayer WS2 coupled with a silica microsphere 2022 Chin. Phys. B 31 104203
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