二次谐波产生
拓扑(电路)
表面二次谐波产生
非线性系统
激发
高次谐波产生
物理
对称(几何)
GSM演进的增强数据速率
谐波
自旋(空气动力学)
非线性光学
联轴节(管道)
凝聚态物理
材料科学
光学
量子力学
计算机科学
数学
电信
几何学
组合数学
冶金
热力学
激光器
作者
Hongping Zhou,Jun Ma,Kai Guo,Fujia Chen,Keya Zhou,Shutian Liu,Zhongyi Guo
摘要
Spin-dependent nonlinear harmonic generations from nanostructures may provide a new class of design for future applications such as nonlinear optical switching and modulation and nonlinear information processing. Most reported works are based on the utilization of metasurfaces with specific symmetry (such as C3 and C4) and the application of the Pancharatnam–Berry phase approach, making them sensitive to local defects. In this work, we investigated a controllable second harmonic generation (SHG) based on the topological spin-dependent edge state, which is robust to a broad class of perturbations. Simulation results demonstrated that spin-dependent edge states with strong field localization can be obtained through spin–orbit coupling, resulting in SHG with increased efficiency. In addition, the propagation direction of the enhanced SHG could be dynamically controlled using an excitation source with left/right circular polarizations, exhibiting negligible backscattering and topological protection against local defects. The proposed approach may open a new avenue for manipulating light–light interactions.
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