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Sci Rep. 2015 Jun 26;5:11793. doi: 10.1038/srep11793.

Plasmonic Toroidal Dipolar Response under Radially Polarized Excitation.

Author information

1
School of Physics, State Key Lab for Mesoscopic Physics, Peking University, Beijing 100871, China.
2
1] School of Physics, State Key Lab for Mesoscopic Physics, Peking University, Beijing 100871, China [2] Collaborative Innovation Center of Quantum Matter, Beijing 100871, China.

Abstract

Plasmonic toroidal resonance has attracted growing interests because of its low loss electromagnetic properties and potential high sensitive nanophotonic applications. However, the realization in a metamaterial requires three-dimensional complicated structural design so far. In this paper, we design a simple metal-dielectric-metal (MIM) sandwich nanostructure, which exhibits a strong toroidal dipolar resonance under radially polarized excitation. The toroidal dipole moment as the dominant contribution for the scattering is demonstrated by the mirror-image method and further analyzed by Lagrangian hybridization model. The proposed toroidal configuration also shows a highly tolerant for misalignment between the structure center and the incident light focus. Our study proves the way for the toroidal plasmonic application with the cylindrical vector beams.

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