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首页> 外文期刊>Optics Letters >Nonlinear optical susceptibility of two-dimensional WS2 measured by hyper Rayleigh scattering
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Nonlinear optical susceptibility of two-dimensional WS2 measured by hyper Rayleigh scattering

机译:通过Hyper Rayleigh散射测量的二维WS2的非线性光学敏感

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摘要

Hyper Rayleigh scattering (HRS) was used to measure the second-order nonlinear susceptibility, chi((2)), for liquid exfoliated WS2 monolayers. To the best of our knowledge, it is the first reported application of the HRS technique to assess the bulk-like chi((2)) of a two-dimensional (2D) material. The concentration-dependent HRS signal indicated a 4.90 +/- 0.30 x 10(-25) esu first hyperpolarizability for 42 nm WS2 monolayers under 1064 nm laser irradiation using para-nitroaniline as an external reference. The corresponding value of chi((2))(xxx) was calculated to be 460 +/- 28 pm V-1. This was within 46% of independent density functional theory predictions. Agreement with theory was improved over related microscopy-based approaches. These results support the use of HRS to evaluate 2D materials for nonlinear frequency mixing applications. (C) 2017 Optical Society of America
机译:用于测量液体剥离WS2单层的二阶散射散射(HRS)测量二阶非线性敏感性Chi((2))。 据我们所知,首次报告的HRS技术申请评估二维(2D)材料的散装CHI((2))。 浓度依赖性HRS信号指示4.90 +/- 0.30×10(-25)ESU,首先使用Para-Nitaniline作为外部参考的1064nm激光辐射下的42nm WS2单层的高分子化性。 CHI((2))(XXX)的相应值计算为460 +/- 28MPV-1。 这是独立密度泛函理论预测的46%。 与 理论 协议 经 有关 基于 显微镜 的办法 改善。 这些结果支持使用HRS来评估2D用于非线性频率混合应用的材料。 (c)2017年光学学会

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