期刊
APPLIED PHYSICS LETTERS
卷 101, 期 14, 页码 -出版社
AMER INST PHYSICS
DOI: 10.1063/1.4757613
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资金
- US National Science Foundation (NSF) Nanoscale Science and Engineering Center [CMMI-0751621]
- National Natural Science Foundation of China [10904012, 11174051, 11004026, 61007018]
- Samsung Scholarship Foundation, Republic of Korea
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. (C) 2012 American Institute of Physics. [http://dx.doi.org/10.1063/1.4757613]
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