Optical toroidal dipolar response by an asymmetric double-bar metamaterial

Zheng Gao Dong, Jie Zhu, Junsuk Rho, Jia Qi Li, Changgui Lu, Xiaobo Yin, X. Zhang

Research output: Journal article publicationJournal articleAcademic researchpeer-review

111 Citations (Scopus)


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.
Original languageEnglish
Article number144105
JournalApplied Physics Letters
Issue number14
Publication statusPublished - 1 Oct 2012
Externally publishedYes

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)


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