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3R MoS2 with Broken Inversion Symmetry: A Promising Ultrathin Nonlinear Optical Device
Advanced Materials ( IF 27.4 ) Pub Date : 2017-06-07 , DOI: 10.1002/adma.201701486 Jia Shi 1, 2 , Peng Yu 3 , Fucai Liu 3 , Peng He 4 , Rui Wang 1 , Liang Qin 1, 2 , Junbo Zhou 1, 2 , Xin Li 1, 2 , Jiadong Zhou 3 , Xinyu Sui 1, 2 , Shuai Zhang 1 , Yanfeng Zhang 5, 6 , Qing Zhang 6 , Tze Chien Sum 7 , Xiaohui Qiu 1 , Zheng Liu 3 , Xinfeng Liu 1
Advanced Materials ( IF 27.4 ) Pub Date : 2017-06-07 , DOI: 10.1002/adma.201701486 Jia Shi 1, 2 , Peng Yu 3 , Fucai Liu 3 , Peng He 4 , Rui Wang 1 , Liang Qin 1, 2 , Junbo Zhou 1, 2 , Xin Li 1, 2 , Jiadong Zhou 3 , Xinyu Sui 1, 2 , Shuai Zhang 1 , Yanfeng Zhang 5, 6 , Qing Zhang 6 , Tze Chien Sum 7 , Xiaohui Qiu 1 , Zheng Liu 3 , Xinfeng Liu 1
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Nonlinear 2D layered crystals provide ideal platforms for applications and fundamental studies in ultrathin nonlinear optical (NLO) devices. However, the NLO frequency conversion efficiency constrained by lattice symmetry is still limited by layer numbers of 2D crystals. In this work, 3R MoS2 with broken inversion symmetry structure are grown and proved to be excellent NLO 2D crystals from monolayer (0.65 nm) toward bulk‐like (300 nm) dimension. Thickness and wavelength‐dependent second harmonic generation spectra offer the selection rules of appropriate working conditions. A model comprising of bulk nonlinear contribution and interface interaction is proposed to interpret the observed nonlinear behavior. Polarization enhancement with two petals along staggered stacking direction appears in 3R MoS2 is first observed and the robust polarization of 3R MoS2 crystal is caused by the retained broken inversion symmetry. The results provide a new arena for realizing ultrathin NLO devices for 2D layered materials.
中文翻译：
具有反转反转对称性的3R MoS2：一种有前途的超薄非线性光学器件
非线性2D层状晶体为超薄非线性光学（NLO）器件的应用和基础研究提供了理想的平台。但是，受晶格对称性约束的NLO频率转换效率仍然受2D晶体的层数限制。在这项工作中，生长了具有反转反转对称结构的3R MoS 2，并被证明是从单层（0.65 nm）到块状（300 nm）尺寸的出色NLO 2D晶体。厚度和与波长有关的二次谐波产生光谱提供了适当工作条件的选择规则。提出了一个由体非线性贡献和界面相互作用组成的模型，以解释所观察到的非线性行为。在3R MoS中出现了两瓣沿着错开的堆叠方向的极化增强首先观察到图2，并且3R MoS 2晶体的稳健极化是由保留的破碎反转对称性引起的。结果为实现用于2D分层材料的超薄NLO设备提供了新的舞台。
更新日期：2017-06-07
中文翻译：
具有反转反转对称性的3R MoS2：一种有前途的超薄非线性光学器件
非线性2D层状晶体为超薄非线性光学（NLO）器件的应用和基础研究提供了理想的平台。但是，受晶格对称性约束的NLO频率转换效率仍然受2D晶体的层数限制。在这项工作中，生长了具有反转反转对称结构的3R MoS 2，并被证明是从单层（0.65 nm）到块状（300 nm）尺寸的出色NLO 2D晶体。厚度和与波长有关的二次谐波产生光谱提供了适当工作条件的选择规则。提出了一个由体非线性贡献和界面相互作用组成的模型，以解释所观察到的非线性行为。在3R MoS中出现了两瓣沿着错开的堆叠方向的极化增强首先观察到图2，并且3R MoS 2晶体的稳健极化是由保留的破碎反转对称性引起的。结果为实现用于2D分层材料的超薄NLO设备提供了新的舞台。
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