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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 20, Iss. 1 — Jan. 2, 2012
  • pp: 524–533

A simple model for the resonance shift of localized plasmons due to dielectric particle adhesion

Tomasz J. Antosiewicz, S. Peter Apell, Virginia Claudio, and Mikael Käll  »View Author Affiliations

Optics Express, Vol. 20, Issue 1, pp. 524-533 (2012)

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Ultrasensitive detectors based on localized surface plasmon resonance refractive index sensing are capable of detecting very low numbers of molecules for biochemical analysis. It is well known that the sensitivity of such sensors crucially depends on the spatial distribution of the electromagnetic field around the metal surface. However, the precise connection between local field enhancement and resonance shift is seldom discussed. Using a quasistatic approximation, we developed a model that relates the sensitivity of a nanoplasmonic resonator to the local field in which the analyte is placed. The model, corroborated by finite-difference time-domain simulations, may be used to estimate the magnitude of the shift as a function of the properties of the sensed object – permittivity and volume – and its location on the surface of the resonator. It requires only a computation of the resonant field induced by the metal structure and is therefore suitable for numerical optimization of nanoplasmonic sensors.

© 2011 OSA

OCIS Codes
(240.6490) Optics at surfaces : Spectroscopy, surface
(240.6680) Optics at surfaces : Surface plasmons
(280.0280) Remote sensing and sensors : Remote sensing and sensors

ToC Category:
Optics at Surfaces

Original Manuscript: October 3, 2011
Revised Manuscript: November 4, 2011
Manuscript Accepted: November 9, 2011
Published: December 21, 2011

Tomasz J. Antosiewicz, S. Peter Apell, Virginia Claudio, and Mikael Käll, "A simple model for the resonance shift of localized plasmons due to dielectric particle adhesion," Opt. Express 20, 524-533 (2012)

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