Toroidal Dipolar Response in a Metamaterial

Author:

Kaelberer T.1,Fedotov V. A.1,Papasimakis N.1,Tsai D. P.23,Zheludev N. I.1

Affiliation:

1. Optoelectronics Research Centre and Centre for Photonic Metamaterials, University of Southampton, Southampton SO17 1BJ, UK.

2. Department of Physics, National Taiwan University, Taipei 10617, Taiwan.

3. Instrument Technology Research Center, National Applied Research Laboratories, Hsinchu 300, Taiwan.

Abstract

Making a Point with Metamaterials A long-predicted electromagnetic excitation, the toroidal moment (or anapole), is associated with toroidal shape and current flow within a structure and has been implicated in nuclear and particle physics. This distinct family of electromagnetic excitations has not been observed directly because they are masked by much stronger electric and magnetic multipoles. Kaelberer et al. (p. 1510 , published online 4 November) have developed a metamaterial structure based on stacked loops of inverted split-ring resonators (“metamolecules”) whose response under excitation is consistent with the existence of a toroidal moment. The metamaterial is designed so that both the electric and magnetic dipole moments induced by an incident electromagnetic wave are suppressed, while the toroidal response is isolated and resonantly enhanced to a detectable level.

Publisher

American Association for the Advancement of Science (AAAS)

Subject

Multidisciplinary

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