All-Dielectric Resonant Metasurfaces with a Strong Toroidal Response

被引：142
|
作者：
Tuz, Vladimir R. [1 ,2 ]
Khardikov, Vyacheslav V. [1 ,2 ,3 ]
Kivshar, Yuri S. [4 ]
机构：
[1] Jilin Univ, Coll Elect Sci & Engn, State Key Lab Integrated Optoelect, Int Ctr Future Sci, 2699 Qianjin St, Changchun 130012, Jilin, Peoples R China
[2] Natl Acad Sci Ukraine, Inst Radio Astron, 4 Mystetstv St, UA-61002 Kharkov, Ukraine
[3] Kharkov Natl Univ, Sch Radio Phys, 4 Svobody Sq, UA-61022 Kharkov, Ukraine
[4] Australian Natl Univ, Nonlinear Phys Ctr, Canberra, ACT 2601, Australia
来源：
ACS PHOTONICS | 2018年 / 5卷 / 05期
基金：
澳大利亚研究理事会;
关键词：
metamaterials; Mie theory; trapped modes; subwavelength structures; nanostructures; TRAPPED MODES; METAMATERIALS; FREQUENCIES; MOMENTS;
D O I：
10.1021/acsphotonics.8b00098
中图分类号：
TB3 [工程材料学];
学科分类号：
0805 ; 080502 ;
摘要：
We demonstrate how to design all-dielectric metasurfaces with a strong axial toroidal response by arranging two types of nanodisks into asymmetric quadrumer clusters. This toroidal response is related to the existence of the trapped (dark) mode that appears due to a symmetry breaking in the cluster. We uncover a correlation between the existence of the toroidal response and asymmetry in the metasurface geometries, which originates from different diameters of nanodisks or notches introduced into nanodisks. Because of the unique field configuration of the toroidal mode, the proposed metasurface could serve as a platform for efficient light matter interaction for enhanced absorption, nonlinear response, and sensing.
引用
收藏
页码：1871 / 1876
页数：11
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