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在原子层的GaSe中强大的第二子生成
Xu Zhou, Jingxin Cheng1, Yubing Zhou
1‡State Key Laboratory of Surface Physics, Key Laboratory of Micro and Nano Photonic Structures (MOE), Collaborative Innovation Center of Advanced Microstructures and Department of Physics, Fudan University, Shanghai 200433, China.
Journal of the American Chemical Society
|June 11, 2015
概括
研究人员观察到高二 (GaSe) 原子层中的强光二生成 (SHG). 在GaSe中,这种非线性光学效应是两维 (2D) 材料中报告的最强的效应,为其特性提供了新的见解.
科学领域:
- 材料科学 材料科学 材料科学
- 凝聚物质物理学 凝聚物质物理学
- 光电学是指光电子产品.
背景情况:
- 在二维 (2D) 原子层材料中的非线性光学现象正在获得显著的关注.
- 这些效应,包括非线性光学边缘响应和山谷/旋转电流,扩大了2D材料的潜在应用.
- 在新兴的二维材料中探索新型非线性效应对于技术进步至关重要.
研究的目的:
- 报告第一个在单层化 (GaSe) 中强光二生成 (SHG) 的观察.
- 在非共振激发和发射条件下研究GaSe的非线性光学特性.
- 使用SHG探测GaSe原子层的对称性和结构性质.
主要方法:
- 在单层和双层GaSe.Se中实验观察光学第二和生成 (SHG).
- 在波长为1600nm的非共振激发和发射光谱学.
- 偏振依赖的SHG强度测量和SHG映射.
- 在GaSe.Se中分析格子对称性和堆叠顺序 (AA,AB).
主要成果:
- 单层GaSe表现出非常强的非共振SHG,超过迄今为止测量的其他二维原子晶体.
- 来自单层GaSe的SHG信号在相同的激发功率下比MoS2的信号强出1-2个数量级.
- 单层GaSe显示3倍格子对称性,与其三角形状相关联.
- 双层GaSe显示主导的AA和AB堆叠顺序,边缘配置在不同层中一致.
结论:
- 在目前研究的二维原子晶体中,GaSe具有最强的非线性光学响应.
- SHG是一种强大的工具,用于研究GaSe原子层的结构和对称性.
- 这些发现为探索GaSe和类似材料中的其他非线性光学效应开辟了道路.
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