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Journal of the Optical Society of America A

Journal of the Optical Society of America A

| OPTICS, IMAGE SCIENCE, AND VISION

  • Editor: Franco Gori
  • Vol. 29, Iss. 6 — Jun. 1, 2012
  • pp: 994–1002

Theoretical limit of localized surface plasmon resonance sensitivity to local refractive index change and its comparison to conventional surface plasmon resonance sensor

Sergiy J. Zalyubovskiy, Maria Bogdanova, Alexei Deinega, Yurii Lozovik, Andrew D. Pris, Kwang Hyup An, W. Paige Hall, and Radislav A. Potyrailo  »View Author Affiliations


JOSA A, Vol. 29, Issue 6, pp. 994-1002 (2012)
http://dx.doi.org/10.1364/JOSAA.29.000994


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Abstract

In this paper, the theoretical sensitivity limit of the localized surface plasmon resonance (LSPR) to the surrounding dielectric environment is discussed. The presented theoretical analysis of the LSPR phenomenon is based on perturbation theory. Derived results can be further simplified assuming quasistatic limit. The developed theory shows that LSPR has a detection capability limit independent of the particle shape or arrangement. For a given structure, sensitivity is directly proportional to the resonance wavelength and depends on the fraction of the electromagnetic energy confined within the sensing volume. This fraction is always less than unity; therefore, one should not expect to find an optimized nanofeature geometry with a dramatic increase in sensitivity at a given wavelength. All theoretical results are supported by finite-difference time-domain calculations for gold nanoparticles of different geometries (rings, split rings, paired rings, and ring sandwiches). Numerical sensitivity calculations based on the shift of the extinction peak are in good agreement with values estimated by perturbation theory. Numerical analysis shows that, for thin (10nm) analyte layers, sensitivity of the LSPR is comparable with a traditional surface plasmon resonance sensor and LSPR has the potential to be significantly less sensitive to temperature fluctuations.

© 2012 Optical Society of America

OCIS Codes
(240.6680) Optics at surfaces : Surface plasmons
(260.3910) Physical optics : Metal optics
(290.3030) Scattering : Index measurements
(280.4788) Remote sensing and sensors : Optical sensing and sensors
(050.6624) Diffraction and gratings : Subwavelength structures

ToC Category:
Optics at Surfaces

History
Original Manuscript: January 10, 2012
Manuscript Accepted: February 23, 2012
Published: May 25, 2012

Citation
Sergiy J. Zalyubovskiy, Maria Bogdanova, Alexei Deinega, Yurii Lozovik, Andrew D. Pris, Kwang Hyup An, W. Paige Hall, and Radislav A. Potyrailo, "Theoretical limit of localized surface plasmon resonance sensitivity to local refractive index change and its comparison to conventional surface plasmon resonance sensor," J. Opt. Soc. Am. A 29, 994-1002 (2012)
http://www.opticsinfobase.org/josaa/abstract.cfm?URI=josaa-29-6-994

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