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Optics Express

Optics Express

  • Editor: Michael Duncan
  • Vol. 14, Iss. 21 — Oct. 16, 2006
  • pp: 9988–9999

Plasmons in nearly touching metallic nanoparticles: singular response in the limit of touching dimers

Isabel Romero, Javier Aizpurua, Garnett W. Bryant, and F. Javier García de Abajo  »View Author Affiliations


Optics Express, Vol. 14, Issue 21, pp. 9988-9999 (2006)
http://dx.doi.org/10.1364/OE.14.009988


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Abstract

The response of gold nanoparticle dimers is studied theoretically near and beyond the limit where the particles are touching. As the particles approach each other, a dominant dipole feature is observed that is pushed into the infrared due to interparticle coupling and that is associated with a large pileup of induced charge in the interparticle gap. The redshift becomes singular as the particle separation decreases. The response weakens for very small separation when the coupling across the interparticle gap becomes so strong that dipolar oscillations across the pair are inhibited. Lower-wavelength, higher-order modes show a similar separation dependence in nearly touching dimers. After touching, singular behavior is observed through the emergence of a new infrared absorption peak, also accompanied by huge charge pileup at the interparticle junction, if initial interparticle contact is made at a single point. This new mode is distinctly different from the lowest mode of the separated dimer. When the junction is made by contact between flat surfaces, charge at the junction is neutralized and mode evolution is continuous through contact. The calculated singular response explains recent experiments on metallic nanoparticle dimers and is relevant in the design of nanoparticle-based sensors and plasmon circuits.

© 2006 Optical Society of America

OCIS Codes
(240.6680) Optics at surfaces : Surface plasmons
(350.4990) Other areas of optics : Particles

ToC Category:
Optics at Surfaces

History
Original Manuscript: July 27, 2006
Revised Manuscript: August 29, 2006
Manuscript Accepted: August 29, 2006
Published: October 16, 2006

Citation
Isabel Romero, Javier Aizpurua, Garnett W. Bryant, and F. Javier García De Abajo, "Plasmons in nearly touching metallic nanoparticles: singular response in the limit of touching dimers," Opt. Express 14, 9988-9999 (2006)
http://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-14-21-9988


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