Optical toroidal dipolar response by an asymmetric double-bar metamaterial

被引：115

作者：

Dong, Zheng-Gao ^{[1
,2
]}

Zhu, J. ^{[2
]}

Rho, Junsuk ^{[2
]}

Li, Jia-Qi ^{[1
]}

Lu, Changgui ^{[2
]}

Yin, Xiaobo ^{[2
]}

Zhang, X. ^{[2
]}

机构：

[1] Southeast Univ, Dept Phys, Nanjing 211189, Jiangsu, Peoples R China

[2] Univ Calif Berkeley, Nanoscale Sci & Engn Ctr, Berkeley, CA 94720 USA

来源：

APPLIED PHYSICS LETTERS | 2012年 / 101卷 / 14期

基金：

美国国家科学基金会; 中国国家自然科学基金;

关键词：

REFRACTION;

D O I：

10.1063/1.4757613

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

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. (C) 2012 American Institute of Physics. [http://dx.doi.org/10.1063/1.4757613]

引用

页数：4

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