Intrinsically or extrinsically reconfigurable chirality in plasmonic chiral metasurfaces
Intrinsically or extrinsically reconfigurable chirality in plasmonic chiral metasurfaces
复制标题
等离子体手性超表面中内在或外在可重构手性
DOI：
10.1016/j.optcom.2019.05.006
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发表时间：
2019
影响因子：
2.4
通讯作者：
Liu Yan Jun
中科院分区：
文献类型：
--
作者：
Yin Shengtao;Ji Wei;Xiao Dong;Li Yu;Li Ke;Yin Zhen;Jiang Shouzhen;Shao Liyang;Luo Dan;Liu Yan Jun
在这项工作中，我们从理论上提出了一种基于金属-绝缘体-金属夹层结构的可重构等离子体手性亚表面，它可以强自旋选择性地吸收圆偏振光。通过有限差分的时间域模拟，左右手圆偏振光在共振位置的吸收率可以达到近100%，圆二向色性的大小可以达到80%，这比以往报道的大部分数值都要大。这种强烈的手势效应源于入射圆偏振光引起的等离子体激元共振。此外，提出的等离子体手性亚表面可以通过改变其内在或外在手性来重构，这可以通过CD的符号和大小的变化得到数值证实。这种可重构的等离子体手性准表面在手性检测/传感、偏振成像、自旋-轨道通信等方面具有潜在的应用前景。
In this work, we theoretically present a reconfigurable plasmonic chiral metasurface based on a sandwiched metal–insulator–metal structure, which can strongly, spin-selectively absorb circularly polarized light. Through finite-difference time-domain simulation, the absorption of left- or right-handed circularly polarized light can reach nearly 100% at the resonant position, and the magnitude of the circular dichroism can be 80%, which is larger than most of the previously reported value. This strong chiroptical effect originates from plasmonic resonances induced by the incident circularly polarized light. Furthermore, the proposed plasmonic chiral metasurface is able to be reconfigurable by either changing its intrinsic or extrinsic chirality, which can be numerically confirmed by the change of the sign and magnitude of the CD. Such a reconfigurable plasmonic chiral metasurface could find many potential applications in chirality detection/sensing, polarimetric imaging, spin–orbit communications, etc.