太赫兹辐射
手性(物理)
材料科学
圆极化
液晶
自旋(空气动力学)
极化(电化学)
圆二色性
自旋极化
凝聚态物理
光学
光电子学
对称性破坏
物理
手征对称破缺
结晶学
化学
量子力学
热力学
微带线
电子
物理化学
Nambu–Jona Lasinio模型
作者
Yunyun Ji,Fei Fan,Ziyang Zhang,Zhiyu Tan,Xin Zhang,Yiwu Yuan,Jierong Cheng,Shengjiang Chang
出处
期刊:Physical Review Materials
[American Physical Society]
日期:2021-08-03
卷期号:5 (8)
被引量:17
标识
DOI:10.1103/physrevmaterials.5.085201
摘要
Dynamic control of photonic spin state and chirality plays a vital role in various applications, such as polarization control, polarization-sensitive imaging, and biosensing. Here, we present a scheme for the flexible and dynamic manipulation of terahertz spin state conversion and optical chirality by combining two achiral structures: an asymmetric metasurface and a layer of anisotropic liquid crystal. The proposed asymmetric metasurface can realize the polarization conversion effect. For the circularly polarized incidence, it exhibits the asymmetric transmission of the spin-flipped states but no spin-locked optical chirality since its geometry is mirror symmetric along with the wave propagation. The introduction of the liquid crystal makes the composite metasurface not only exhibit the spin state conversion but also spin-locked chirality and spin-flipped chirality on account of breaking mirror symmetry, which realizes an electrically active terahertz chiral device. The experimental results show that the asymmetric transmission of the terahertz spin states can be dynamically manipulated, resulting in a large controllable range 83.8% to \ensuremath{-}30.7% of spin-locked circular dichroism at 0.76 THz and \ensuremath{-}98.2% to 44.7% of spin-flipped circular dichroism at 0.73 THz. This work paves the way for the development of terahertz meta devices capable of enabling active photonic spin state and chirality manipulation.
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