Characterization of second-order nonlinear optical properties of two-dimensional transition metal dichalcogenides (Conference Presentation)

W. Murray, Ana Laura-Elias, K. Fujisawa, Michael C. Lucking, Ethan Kahn, Yimin Ding, H. Terrones, M. Terrones, X. Ni, Zhiwen Liu
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Abstract

Two-dimensional transition metal dichalcogenides (TMD), such as WS2 and MoS2, have been shown to exhibit large second order optical nonlinearity due to their non-centrosymmetric crystalline symmetry in few odd- and mono-layers, and resonance enhancement. Here we study the second-order nonlinear susceptibility of 2D TMDs through second harmonic generation (SHG) and sum frequency generation (SFG). Using a wavelength-tunable femtosecond laser, we can characterize SHG of TMDs to obtain the second-order nonlinear susceptibility at multiple wavelengths. Along with the experimental studies, theoretical investigation of the second-order nonlinear susceptibility is also performed. With this we explore the estimation of the second-order nonlinear susceptibility of 2D TMD layered materials based on their first-order susceptibility through the experimental and theoretical verification of Miller’s Rule for these materials. Additionally, we characterize the second-order nonlinear susceptibility of 2D TMD alloys through the SFG spectroscopy.
二维过渡金属二硫族化合物二阶非线性光学性质的表征(会议报告)
二维过渡金属二硫族化合物(TMD),如WS2和MoS2,由于其在奇数层和单层中的非中心对称晶体对称性和共振增强而表现出很大的二阶光学非线性。本文通过二次谐波产生(SHG)和和频产生(SFG)研究二维tmd的二阶非线性磁化率。利用波长可调的飞秒激光器,我们可以对tmd的SHG进行表征,从而获得其在多个波长下的二阶非线性磁化率。在实验研究的同时,对二阶非线性磁化率进行了理论研究。在此基础上,通过对二维TMD层状材料的米勒规则的实验和理论验证,探讨了基于一阶磁化率的二维TMD层状材料二阶非线性磁化率的估计。此外,我们还通过SFG光谱表征了二维TMD合金的二阶非线性磁化率。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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