Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
1859188 | Physics Letters A | 2014 | 5 Pages |
Abstract
Optical toroidal resonance in structural variations of the double-disk metamaterial, in viewpoint of an equivalent LC-circuit model, is numerically studied to optimize its geometrically-dependent optical characteristics, such as the enhancement capability of local-field confinement and the extinction coefficient. Responses of high-order magnetic vortex resonances (i.e., the double- and triple-fold vortex modes), in addition to the fundamental toroidal dipole, are excited in accordance with a standing-wave model of oscillating current. The induced strengths for these vortex responses are sensitive, in different manners, to the incident angle of the light, though their frequencies are angularly independent.
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Physical Sciences and Engineering
Physics and Astronomy
Physics and Astronomy (General)
Authors
Jie Li, Jian Shao, Jia-Qi Li, X.Q. Yu, Zheng-Gao Dong, Q. Chen, Y. Zhai,