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Optics Express

Optics Express

  • Editor: Andrew M. Weiner
  • Vol. 21, Iss. 23 — Nov. 18, 2013
  • pp: 27602–27610

Strong coupling between a dipole emitter and localized plasmons: enhancement by sharp silver tips

Stefania D’Agostino, Filippo Alpeggiani, and Lucio Claudio Andreani  »View Author Affiliations


Optics Express, Vol. 21, Issue 23, pp. 27602-27610 (2013)
http://dx.doi.org/10.1364/OE.21.027602


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Abstract

In this work sharp silver nanotips are analyzed and proposed as useful plasmonic tools to reduce the threshold for the onset of strong coupling in the electromagnetic interaction of a point-like emitter with localized surface plasmons. If compared to similarly-sized spherical nanoparticles, conically-shaped nanoparticles turn out to be extremely useful to reduce the oscillator strength requirements for the emitting dipole, a reduction of the threshold by one sixth being obtained in a double cone configuration. Moreover the transition to the strong coupling regime is analyzed for several cone apertures, revealing a nonmonotonic behavior with the appearance of an optimal cone geometry. The emitted-light spectrum is obtained from the computation of the perturbative decay rate and photonic Lamb shift in the classical framework of the Discrete Dipole Approximation. This combined classical-quantum electrodynamics treatment is useful for the theoretical investigation on nonperturbative light-matter interactions involving complex shaped nanoparticles or aggregates.

© 2013 OSA

OCIS Codes
(240.6680) Optics at surfaces : Surface plasmons
(270.5580) Quantum optics : Quantum electrodynamics

ToC Category:
Plasmonics

History
Original Manuscript: July 29, 2013
Revised Manuscript: October 10, 2013
Manuscript Accepted: October 11, 2013
Published: November 4, 2013

Citation
Stefania D’Agostino, Filippo Alpeggiani, and Lucio Claudio Andreani, "Strong coupling between a dipole emitter and localized plasmons: enhancement by sharp silver tips," Opt. Express 21, 27602-27610 (2013)
http://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-21-23-27602


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