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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 17, Iss. 3 — Feb. 2, 2009
  • pp: 2015–2023

Sensitivity enhancement of nanoplasmonic sensors in low refractive index substrates

Björn Brian, Borja Sepúlveda, Yury Alaverdyan, Laura M. Lechuga, and Mikael Käll  »View Author Affiliations


Optics Express, Vol. 17, Issue 3, pp. 2015-2023 (2009)
http://dx.doi.org/10.1364/OE.17.002015


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Abstract

Metal films perforated by nanoholes constitute a powerful platform for surface plasmon resonance biosensing. We find that the refractive index sensitivity of nanohole arrays increases if their resonance is red-shifted by increasing the separation distance between holes. However, an additional sensitivity enhancement occurs if the nanohole sensors are manufactured on low index substrates, despite the fact such substrates significantly blue-shift the resonance. We find a ~40% higher bulk refractive index sensitivity for a system of ~100 nm holes in 20 nm gold films fabricated on Teflon substrates (n=1.32) compared to the case when conventional glass substrates (n=1.52) are used. A similar improvement is observed for the case when a thin layer of dielectric material is deposited on the samples. These results can be understood by considering the electric field distribution induced by the so-called antisymmetric surface plasmon polariton in the thin gold films.

© 2009 Optical Society of America

OCIS Codes
(130.6010) Integrated optics : Sensors
(240.6680) Optics at surfaces : Surface plasmons
(260.3910) Physical optics : Metal optics
(310.6845) Thin films : Thin film devices and applications

ToC Category:
Integrated Optics

History
Original Manuscript: December 22, 2008
Revised Manuscript: January 21, 2009
Manuscript Accepted: January 26, 2009
Published: January 30, 2009

Virtual Issues
Vol. 4, Iss. 4 Virtual Journal for Biomedical Optics

Citation
Björn Brian, Borja Sepúlveda, Yury Alaverdyan, Laura M. Lechuga, and Mikael Käll, "Sensitivity enhancement of nanoplasmonic sensors in low refractive index substrates," Opt. Express 17, 2015-2023 (2009)
http://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-17-3-2015


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