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- Title
Plasmonic Toroidal Dipolar Response under Radially Polarized Excitation.
- Authors
Bao, Yanjun; Zhu, Xing; Fang, Zheyu
- 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.
- Subjects
TOROIDAL plasma; ELECTRONIC excitation; NANOPHOTONICS; NANOSTRUCTURES; VECTOR beams
- Publication
Scientific Reports, 2015, p11793
- ISSN
2045-2322
- Publication type
Article
- DOI
10.1038/srep11793