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Opt Express. 2013 Mar 11;21(5):6609-17. doi: 10.1364/OE.21.006609.

Broadband converging plasmon resonance at a conical nanotip.

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1
Department of Chemical and Biomolecular Engineering, University of Notre Dame,Notre Dame, Indiana 46556, USA.

Abstract

We propose an analytical theory which predicts that Converging Plasmon Resonance (CPR) at conical nanotips exhibits a red-shifted and continuous band of resonant frequencies and suggests potential application of conical nanotips in various fields, such as plasmonic solar cells, photothermal therapy, tip-enhanced Raman and other spectroscopies. The CPR modes exhibit superior confinement and ten times broader scattering bandwidth over the entire solar spectrum than smooth nano-structures. The theory also explicitly connects the optimal angles and resonant optical frequencies to the material permittivities, with a specific optimum half angle that depends only on the real permittivity for high-permittivity and low-loss materials.

PMID:
23482232
[Indexed for MEDLINE]
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