Second Harmonic Generation in Atomically Thin MoTe2,Advanced Optical Materials

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Second Harmonic Generation in Atomically Thin MoTe2
Advanced Optical Materials ( IF 8.0 ) Pub Date : 2018-06-29 , DOI: 10.1002/adom.201701334
Yu Song ₁ , Ruijuan Tian ₁ , Jiulong Yang ₁ , Rui Yin ₁ , Jianlin Zhao ₁ , Xuetao Gan ₁

Affiliation

Optical second harmonic generations (SHGs) from atomically thin MoTe₂ flakes with 2H and 1T′ phases are studied. From 2H‐MoTe₂ samples with odd (even) numbers of layers, strong (negligible) SHGs are observed due to the layer‐dependent broken inversion symmetry. When pumped by a telecom‐band laser, SHG from a monolayer 2H‐MoTe₂ is about one order of magnitude stronger than that from a monolayer WS₂; an extremely high second‐order nonlinear susceptibility of 2.5 nm V⁻¹ is estimated, presenting the highest value among those reported in 2D materials. SHG measurements in MoTe₂ are also demonstrated as an efficient way to distinguish the 2H‐to‐1T′ phase transition. Compared with the SHG in 2H‐MoTe₂, 1T′‐MoTe₂'s SHG has much lower efficiency and the polarization dependence is changed from a six‐fold pattern to a two‐lobe pattern.

中文翻译：

原子薄MoTe2中的第二谐波产生

研究了具有2H和1T'相的原子薄MoTe ₂薄片的光学二次谐波（SHG）。从2H-MoTe _2个具有奇数（偶数）层的样本中，由于依赖于层的破碎反演对称性，观察到了很强（可忽略）的SHG。当用电信激光器泵浦时，单层2H-MoTe _2的SHG比单层WS _2的SHG强约一个数量级。估算出2.5 nm V ^-1的极高二阶非线性磁化率，在2D材料中报道的值中是最高的。MoTe _2中的SHG测量也被证明是区分2H到1T'相变的有效方法。与2H-MoTe _2中的SHG相比，1T'-MoTe ₂的SHG效率低得多，并且偏振相关性从六重模式变为二瓣模式。

更新日期：2018-06-29

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