铌酸锂
圆二色性
材料科学
光子学
手性(物理)
各向异性
非线性系统
基质(水族馆)
二色性
薄膜
光电子学
光学
纳米技术
物理
对称性破坏
化学
结晶学
手征对称破缺
量子力学
海洋学
Nambu–Jona Lasinio模型
地质学
作者
Xianpeng Lv,Shuyao Wu,ziping Tian,Yang Li,Tiefeng Yang,Wentao Qiu,Heyuan Guan,Huihui Lu
出处
期刊:Journal of The Optical Society of America B-optical Physics
[The Optical Society]
日期:2023-03-03
卷期号:40 (5): D15-D15
被引量:2
摘要
Different from conventional two-dimensional photonic metasurfaces, chiral photonic metasurfaces, which are composed of a chiral pattern with subwavelength dimensions, exhibit different chiroptical physical phenomena, such as spin-preserving, nonlinear chiroptical effects, and optical vortex generation. However, the effect of symmetry in the vertical direction on the linear and nonlinear response of the chiral quasi-two-dimensional metasurface has been seldom reported. In this study, we design and simulate a chiral metasurface using topological patterns in lithium niobate (LN) thin film to obtain the optimal circular dichroism and its corresponding nonlinear effect. Triangular holes with a certain rotation constitute a quasi-two-dimensional metasurface, which possesses outstanding chirality for the spin state of light, thus allowing it to control linear and nonlinear chiralities. The nonlinear conversion efficiency η SHG reaches 2×10 −4 and 4×10 −3 on the LN structure with substrate and without substrate, respectively. Nonlinear circular dichroism CD SHG is 5.8 dB at 783 nm on a SiO 2 substrate. This tunable chiral metasurface is expected to be applicable to nonlinear chiroptical responses and chiral light modulation.
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