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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 17, Iss. 24 — Nov. 23, 2009
  • pp: 21802–21807

Near-infrared optical response of thin film pH-sensitive hydrogel coated on a gold nanocrescent array

Hao Jiang, Jan Markowski, and Jayshri Sabarinathan  »View Author Affiliations


Optics Express, Vol. 17, Issue 24, pp. 21802-21807 (2009)
http://dx.doi.org/10.1364/OE.17.021802


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Abstract

A hydrogel-based chemiresponsive sensor for monitoring H+ (pH) has been developed by coating the surface of a gold nanocrescent array structure with a thin film of a poly(2-hydroxylethyl methacrylate)-based (poly-HEMA) hydrogel. The transmission measurement results of the close-packed gold nanocrescent array fabricated via electron beam lithography demonstrate near-infrared localized surface plasmon resonance peaks with sensitivities up to 332nm/RIU in detecting refractive index change. Measurements of the hydrogel under solutions of increasing pH show the plasmon peak blueshifts by 17nm and the integrated transmission increases by 1.8 in the operating range of 4.5 – 6.4 pH, which is ideal for biochemical sensor applications.

© 2009 OSA

OCIS Codes
(240.6680) Optics at surfaces : Surface plasmons
(310.0310) Thin films : Thin films
(220.4241) Optical design and fabrication : Nanostructure fabrication
(280.4788) Remote sensing and sensors : Optical sensing and sensors

ToC Category:
Sensors

History
Original Manuscript: October 8, 2009
Revised Manuscript: October 30, 2009
Manuscript Accepted: November 10, 2009
Published: November 12, 2009

Virtual Issues
Vol. 4, Iss. 13 Virtual Journal for Biomedical Optics

Citation
Hao Jiang, Jan Markowski, and Jayshri Sabarinathan, "Near-infrared optical response of thin film pH-sensitive hydrogel coated on a gold nanocrescent array," Opt. Express 17, 21802-21807 (2009)
http://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-17-24-21802


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