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Optics Express

Optics Express

  • Editor: Andrew M. Weiner
  • Vol. 21, Iss. 5 — Mar. 11, 2013
  • pp: 6609–6617

Broadband converging plasmon resonance at a conical nanotip

Yunshan Wang, Franck Plouraboue, and Hsueh-Chia Chang  »View Author Affiliations

Optics Express, Vol. 21, Issue 5, pp. 6609-6617 (2013)

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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.

© 2013 OSA

OCIS Codes
(240.6680) Optics at surfaces : Surface plasmons
(350.5340) Other areas of optics : Photothermal effects
(350.6050) Other areas of optics : Solar energy
(310.6628) Thin films : Subwavelength structures, nanostructures

ToC Category:
Optics at Surfaces

Original Manuscript: January 3, 2013
Revised Manuscript: February 21, 2013
Manuscript Accepted: March 3, 2013
Published: March 8, 2013

Yunshan Wang, Franck Plouraboue, and Hsueh-Chia Chang, "Broadband converging plasmon resonance at a conical nanotip," Opt. Express 21, 6609-6617 (2013)

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