Journal
PHYSICAL REVIEW A
Volume 97, Issue 3, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevA.97.033816
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Funding
- National Science Foundation of China [61505164, 61771402, 11372248, 11674266, 11674248, 11404213]
- Fundamental Research Funds for the Central Universities [3102017zy033]
- US Department of Energy, Office of Basic Energy Science, Division of Materials Science and Engineering [DE-AC02-07CH11358]
- European Research Council under ERC [320081]
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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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