Photonics Research, 2020, 8 (12): 12001881, Published Online: Nov. 23, 2020  

Superior third-order nonlinearity in inorganic fullerene-like WS2 nanoparticles Download: 589次

Author Affiliations
1 Key Laboratory for Physical Electronics and Devices of the Ministry of Education & Shaanxi Key Laboratory of Information Photonic Technique, School of Electronic Science and Engineering, Xi’an Jiaotong University, Xi’an 710049, China
2 e-mail: jxfang@mail.xjtu.edu.cn
Abstract
Two-dimensional (2D) transition metal dichalcogenides (TMDs) attain increasing attention due to their exceptional nonlinear optical efficiencies, which hold promising potential for on-chip photonics and advanced optoelectronic applications. Planar TMDs have been proven to support orders-higher third-order nonlinear coefficients in comparison with common nonlinear materials. Interestingly, stronger light–matter interaction could be motivated when curved features are introduced to 2D TMDs. Here, a type of inorganic fullerene-like WS2 nanoparticles is chemically synthesized using hard mesoporous silica. By using the spatial self-phase modulation (SSPM) method, the nonlinear refractive index n2 and third-order susceptibility χ(3) are investigated in the visible range. It is found that n210-5 cm2/W and χ(3)10-7 esu, two orders higher than the counterparts of planar WS2 structures. Our experimental findings provide a fresh thinking in designing nonlinear optical materials and endow TMDs with new potentials in photonic integration applications.

Tianlun Li, Rui Hao, Lingling Zhang, Jianyong Mao, Feng Li, Yanpeng Zhang, Jixiang Fang, Lei Zhang. Superior third-order nonlinearity in inorganic fullerene-like WS2 nanoparticles[J]. Photonics Research, 2020, 8(12): 12001881.

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