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Optics Express

Optics Express

  • Editor: Michael Duncan
  • Vol. 13, Iss. 7 — Apr. 4, 2005
  • pp: 2668–2677

Substrate effect on refractive index dependence of plasmon resonance for individual silver nanoparticles observed using darkfield micro-spectroscopy

A. Curry, G. Nusz, A. Chilkoti, and A. Wax  »View Author Affiliations


Optics Express, Vol. 13, Issue 7, pp. 2668-2677 (2005)
http://dx.doi.org/10.1364/OPEX.13.002668


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Abstract

We use optical darkfield micro-spectroscopy to characterize the plasmon resonance of individual silver nanoparticles in the presence of a substrate. The optical system permits multiple individual nanoparticles to be identified visually for simultaneous spectroscopic study. For silver particles bound to a silanated glass substrate, we observe changes in the plasmon resonance due to induced variations in the local refractive index. The shifts in the plasmon resonance are investigated using a simple analytical theory in which the contributions from the substrate and environment are weighted with distance from the nanoparticle. The theory is compared with experimental results to determine a weighting factor which facilitates modeling of environmental refractive index changes using standard Mie code. Use of the optical system for characterizing nanoparticles attached to substrates for biosensing applications is discussed.

© 2005 Optical Society of America

OCIS Codes
(180.0180) Microscopy : Microscopy
(240.6680) Optics at surfaces : Surface plasmons
(290.5850) Scattering : Scattering, particles
(300.6550) Spectroscopy : Spectroscopy, visible

ToC Category:
Research Papers

History
Original Manuscript: February 25, 2005
Revised Manuscript: March 23, 2005
Manuscript Accepted: March 23, 2005
Published: April 4, 2005

Citation
A. Curry, G. Nusz, A. Chilkoti, and A. Wax, "Substrate effect on refractive index dependence of plasmon resonance for individual silver nanoparticles observed using darkfield micro-spectroscopy," Opt. Express 13, 2668-2677 (2005)
http://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-13-7-2668


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