Strong and anisotropic third-harmonic generation in monolayer and multilayer ReS2
Strong and anisotropic third-harmonic generation in monolayer and multilayer ReS2
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DOI：
10.1103/physrevb.95.165406
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发表时间：
2017-04-06
影响因子：
3.7
通讯作者：
Zhao, Hui
中科院分区：
文献类型：
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作者：
Cui, Qiannan;Muniz, Rodrigo A.;Zhao, Hui
我们报告观察到强烈的和各向异性的三次谐波产生（THG）在单层和多层ReS 2。单层ReS 2的三阶非线性光学极化率，垂直条x（3）垂直条，在10（-18）m（2）/V-2的数量级上，这比六方晶格过渡金属二硫属化物如MoS 2的报道结果高约一个数量级。多层样品的三阶非线性光学极化率也得到了类似的幅度。的THG场的强度被发现是依赖于入射光的偏振方向的单层和多层样品。点群对称性分析表明，这样的各向异性是不期望从一个完美的1 T晶格，必须产生的ReS 2晶格中的扭曲。我们的研究结果表明，三倍频测量可以用来表征二维材料的晶格畸变，晶格畸变是重要的非线性光学性质的这种材料。
We report observation of strong and anisotropic third-harmonic generation (THG) in monolayer and multilayer ReS2. The third-order nonlinear optical susceptibility of monolayer ReS2, vertical bar chi((3))vertical bar, is on the order of 10(-18) m(2)/V-2, which is about one order of magnitude higher than reported results for hexagonal-lattice transition metal dichalcogenides such as MoS2. A similar magnitude for the third-order nonlinear optical susceptibility was also obtained for a multilayer sample. The intensity of the THG field was found to be dependent on the direction of the incident light polarization for both monolayer and multilayer samples. A point group symmetry analysis shows that such anisotropy is not expected from a perfect 1T lattice and must arise from the distortions in the ReS2 lattice. Our results show that THG measurements can be used to characterize lattice distortions of two-dimensional materials and that lattice distortions are important for the nonlinear optical properties of such materials.