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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 19, Iss. 10 — May. 9, 2011
  • pp: 9213–9220

Local refractive index sensitivity of plasmonic nanoparticles

Marek Piliarik, Pavel Kvasnička, Nicolle Galler, Joachim R. Krenn, and Jiří Homola  »View Author Affiliations

Optics Express, Vol. 19, Issue 10, pp. 9213-9220 (2011)

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We report on an experimental characterization of the sensitivity of localized surface plasmons (LSP) to local changes in the refractive index at a nanometer scale. The method is based on forming a polymer mask covering different well defined areas of metallic nanoparticles and measuring the extinction peak shifts associated with the local refractive index changes. Arrays of nanoparticles (nanorod chains) are prepared using electron beam lithography and the dielectric mask is aligned with respect to the nanoparticle array in a second lithographic step. Extinction peak shifts corresponding to different positions of the mask are measured and values for the local refractive index sensitivity are deduced. A deconvolution procedure is established and used to map the local sensitivity across the surface of nanoparticle based on measured data. The experimental results are shown to correspond well with theoretical simulations obtained using the finite-difference time-domain method. The results indicate that the sensitivity is strongly correlated with the profile of the LSP electric field.

© 2011 OSA

OCIS Codes
(240.6680) Optics at surfaces : Surface plasmons
(280.4788) Remote sensing and sensors : Optical sensing and sensors
(310.6628) Thin films : Subwavelength structures, nanostructures

ToC Category:
Optics at Surfaces

Original Manuscript: March 16, 2011
Revised Manuscript: April 18, 2011
Manuscript Accepted: April 20, 2011
Published: April 26, 2011

Virtual Issues
Vol. 6, Iss. 6 Virtual Journal for Biomedical Optics

Marek Piliarik, Pavel Kvasnička, Nicolle Galler, Joachim R. Krenn, and Jiří Homola, "Local refractive index sensitivity of plasmonic nanoparticles," Opt. Express 19, 9213-9220 (2011)

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