Photonics Research, 2019, 7 (12): 12001493, Published Online: Nov. 22, 2019   

Third-order nonlinear optical properties of WTe2 films synthesized by pulsed laser deposition Download: 594次

Author Affiliations
1 Shaanxi Joint Laboratory of Graphene, State Key Laboratory Incubation Base of Photoelectric Technology and Functional Materials, International Collaborative Center on Photoelectric Technology and Nano Functional Materials, Institute of Photonics & Photon-Technology, Northwest University, Xi’an 710069, China
2 National Laboratory of Solid State Microstructures, Collaborative Innovation Center of Advanced Microstructures, School of Electronic Science and Engineering, Nanjing University, Nanjing 210093, China
3 School of Electronic Engineering, Xi’an University of Posts and Telecommunications, Xi’an 710121, China
4 e-mail: xfwang@nju.edu.cn
5 e-mail: rzy@nwu.edu.cn
Abstract
The prominent third-order nonlinear optical properties of WTe2 films are studied through the Z-scan technique using a femtosecond pulsed laser at 1030 nm. Open-aperture (OA) and closed-aperture (CA) Z-scan measurements are performed at different intensities to investigate the nonlinear absorption and refraction properties of WTe2 films. OA Z-scan results show that WTe2 films always hold a saturable absorption characteristic without transition to reverse saturable absorption. Further, a large nonlinear absorption coefficient β is determined to be 3.37×103 cm/GW by fitting the OA Z-scan curve at the peak intensity of 15.603 GW/cm2. In addition, through the slow saturation absorption model, the ground state absorption cross section, excited state absorption cross section, and absorber’s density were found to be 1.4938×10 16 cm2, 1.2536×10 16 cm2, and 6.2396×1020 cm 3, respectively. CA Z-scan results exhibit a classic peak–valley shape of the CA Z-scan signal, which reveals a self-defocusing optical effect of WTe2 films under the measured environment. Furthermore, a considerable nonlinear refractive index value n2 can be obtained at 1.629×10 2 cm2/GW. Ultimately, the values of the real and imaginary parts of the third-order nonlinear s

Mi He, Yequan Chen, Lipeng Zhu, Huan Wang, Xuefeng Wang, Xinlong Xu, Zhanyu Ren. Third-order nonlinear optical properties of WTe2 films synthesized by pulsed laser deposition[J]. Photonics Research, 2019, 7(12): 12001493.

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