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Achieving a high-Q response in metamaterials by manipulating the toroidal excitations

TitleAchieving a high-Q response in metamaterials by manipulating the toroidal excitations
Publication TypeJournal Article
Year of Publication2018
AuthorsFan, YC, Zhang, FL, Shen, NH, Fu, QH, Wei, ZY, Li, HQ, Soukoulis, CM
JournalPhysical Review A
Date Published03
Type of ArticleArticle
ISBN Number2469-9926
Accession NumberWOS:000427110600015
Keywordsoptics, physics, resonance, Spectroscopy, systems

The excitation of toroidal multipoles in metamaterials is investigated for a high-Q response at a subwavelength scale. In this paper, we explore the optimization of toroidal excitations in a planar metamaterial comprised of asymmetric split ring resonators (ASRRs). It is found that the scattering power of a toroidal dipole can be remarkably strengthened by adjusting the characteristic parameter of ASRRs: an asymmetric factor. Interestingly, the improvement in toroidal excitation accompanies an increment of the Q factor of the toroidal metamaterial; it is shown that both the scattering power of the toroidal dipole and the Q factor increase more than one order by changing the asymmetric factor of ASRRs. The optimization in the excitation of a toroidal multipole provides an opportunity to further increase the Q factor of the metamaterial and boost light-matter interactions at the subwavelength scale for potential applications in low-power nonlinear processing and sensitive photonic applications.

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Short TitlePhys. Rev. A