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Journal Articles Optics Express Year : 2013

Broadband converging plasmon resonance at a conical nanotip

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.
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Dates and versions

hal-00824640 , version 1 (22-05-2013)

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Yunshan Wang, Franck Plouraboué, Hsueh-Chia Chang. Broadband converging plasmon resonance at a conical nanotip. Optics Express, 2013, vol. 21, pp.6609-6617. ⟨10.1364/OE.21.006609⟩. ⟨hal-00824640⟩
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