Low-loss and high-Q planar metamaterial with toroidal moment

被引：162

作者：

Fan, Yuancheng ^{[1
,2
,3
,4
]}

Wei, Zeyong ^{[1
,2
]}

Li, Hongqiang ^{[1
,2
]}

Chen, Hong ^{[1
,2
]}

Soukoulis, Costas M. ^{[3
,4
,5
]}

机构：

[1] Tongji Univ, Key Lab Adv Microstruct Mat MOE, Shanghai 200092, Peoples R China

[2] Tongji Univ, Dept Phys, Shanghai 200092, Peoples R China

[3] Iowa State Univ, Ames Lab, Ames, IA 50011 USA

[4] Iowa State Univ, Dept Phys & Astron, Ames, IA 50011 USA

[5] FORTH, Inst Elect Struct & Laser, Iraklion 71110, Crete, Greece

来源：

PHYSICAL REVIEW B | 2013年 / 87卷 / 11期

关键词：

INDEX;

D O I：

10.1103/PhysRevB.87.115417

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

We experimentally observe toroidal dipolar response in a planar metamaterial comprised of asymmetric split-ring resonators (ASRRs) at microwave frequency. It is shown that a toroidal molecule can be constructed through rational arrangement of planar ASRRs as meta-atoms via manipulating structural symmetry and thus coupling of the meta-atoms. We find that the toroidal resonance provides a subwavelength-scale electromagnetic localization style, and that confining the electromagnetic field inside a dielectric medium with toroidal geometry is beneficial for low-loss metamaterials. The planar scheme of manipulating the coupling among the ASRRs may stimulate research in optical regions involving toroidal multipoles. The toroidal geometry together with the Fano resonance of ASRR-induced high-Q response will have enormous potential applications in enhancing light-matter interactions, e. g., for low-threshold lasing, low-power nonlinear processing, and sensitive biosensing. DOI: 10.1103/PhysRevB.87.115417

引用

页数：5

共 41 条

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