Optical responses of magnetic-vortex resonance in double-disk metamaterial variations |
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Affiliation: | Physics Department and Key Laboratory of MEMS of the Ministry of Education, Southeast University, Nanjing 211189, China |
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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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Keywords: | Toroidal multipole Metamaterial Surface plasmon Magnetic-vortex resonance |
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