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Third-order nonlinear optical properties of WTe2 films synthesized by pulsed laser deposition

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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 susceptibility of WTe2 are roughly estimated to be ?5.93×10?9 and ?1.01×10?8 esu with the help of first-principles calculations. WTe2 possesses sizeable third-order nonlinear coefficients compared with other materials, which suggests that it has great potential to improve performance in nonlinear optical devices.

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DOI:10.1364/PRJ.7.001493

所属栏目:Optical and Photonic Materials

基金项目:International Cooperative Program; National Natural Science Foundation of China10.13039/501100001809;

收稿日期:2019-06-04

录用日期:2019-09-06

网络出版日期:2019-11-22

作者单位    点击查看

Mi He: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
Yequan Chen:National Laboratory of Solid State Microstructures, Collaborative Innovation Center of Advanced Microstructures, School of Electronic Science and Engineering, Nanjing University, Nanjing 210093, China
Lipeng Zhu:School of Electronic Engineering, Xi’an University of Posts and Telecommunications, Xi’an 710121, China
Huan Wang: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
Xuefeng Wang:National Laboratory of Solid State Microstructures, Collaborative Innovation Center of Advanced Microstructures, School of Electronic Science and Engineering, Nanjing University, Nanjing 210093, Chinae-mail: xfwang@nju.edu.cn
Xinlong Xu: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
Zhanyu Ren: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, Chinae-mail: rzy@nwu.edu.cn

联系人作者:Xuefeng Wang(xfwang@nju.edu.cn); Zhanyu Ren(rzy@nwu.edu.cn);

备注:International Cooperative Program; National Natural Science Foundation of China10.13039/501100001809;

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引用该论文

Mi He, Yequan Chen, Lipeng Zhu, Huan Wang, Xuefeng Wang, Xinlong Xu, and Zhanyu Ren, "Third-order nonlinear optical properties of WTe2 films synthesized by pulsed laser deposition," Photonics Research 7(12), 1493-1500 (2019)

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