Optical toroidal dipolar response by an asymmetric double-bar metamaterial
Optical toroidal dipolar response by an asymmetric double-bar metamaterial
复制标题
非对称双棒超材料的光学环形偶极响应
DOI：
10.1063/1.4757613
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发表时间：
2012-10-01
影响因子：
4
通讯作者：
Zhang, X.
中科院分区：
文献类型：
--
作者：
Dong, Zheng-Gao;Zhu, J.;Zhang, X.
我们证明，环形偶极响应可以实现在光学制度，通过设计一个可行的纳米结构的超材料，包括组装成一个环形配置的非对称双杆磁谐振器。数值计算证实了光学环向偶极矩在其他矩中占主导地位。该响应的特征在于在环形中心处的E场分量的强限制，其取向垂直于H-涡旋平面。共振增强的光学环向响应可以为研究与环向矩相关的各种有趣的光学现象提供一条实验途径。
We demonstrate that the toroidal dipolar response can be realized in the optical regime by designing a feasible nanostructured metamaterial, comprising asymmetric double-bar magnetic resonators assembled into a toroid-like configuration. It is confirmed numerically that an optical toroidal dipolar moment dominates over other moments. This response is characterized by a strong confinement of an E-field component at the toroid center, oriented perpendicular to the H-vortex plane. The resonance-enhanced optical toroidal response can provide an experimental avenue for various interesting optical phenomena associated with the elusive toroidal moment.