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Multispectral Refractive Index Sensing Using Surface Plasmon Resonance on Gold Nanoslits

Published online by Cambridge University Press:  01 February 2011

Pei-Yu Chung ,
Kuang-Li Lee ,
Gregory Schultz ,
Pei-Kuen Wei  and
Christopher Batich
Pei-Yu Chung
Affiliation:
pinkychung668@ufl.edu, University of Florida, Materials Science and Engineering, Gainesville, Florida, United States
Kuang-Li Lee
Affiliation:
kllee@gate.sinica.edu.tw, Academia Sinica, Research Center for Applied Sciences, Taipei, Taiwan, Province of China
Gregory Schultz
Affiliation:
schultzg@obgyn.ufl.edu, University of Florida, Obstetrics and Gynecology, Gainesville, Florida, United States
Pei-Kuen Wei
Affiliation:
pkwei@gate.sinica.edu.tw, Academia Sinica, Research Center for Applied Sciences, Taipei, Taiwan, Province of China
Christopher Batich
Affiliation:
cbati@mse.ufl.edu, University of Flordia, Materials Science and Engineering, Gainesville, Florida, United States
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Abstract

Surface plasmon resonance (SPR) biosensors are widely used in sensitive chemical, biological and environmental sensing. Recently, the studies of nano-plasmonics in metallic structures have shown that surface plasmons can also be excited by the metallic nanostructures films which can be used for high-throughput and chip-based SPR type sensing. We developed a class of plasmonic crystal-like structures consisting of a film with arrays of periodic nanoslit geometry. Because the engineered array ensures multiple resonance modes, we use the multispectral analysis to evaluate the refractive index sensing capability. Different from the common method monitoring a single peak shift, the multispectral analysis, observing all the peak shifts and intensity changes in the multiple plasmonic resonances in the spectra, can improve the signal-to-noise ratio of the system and enhance the sensing capabilities. In this investigation, we studied the best condition for the gold nanoslit arrays by testing their ability for refractive index sensing, and a high sensitivity of up to 28586 %T nm/RIU was obtained by multispectral analysis (RIU = refreactive index unit, and T= transmission).

Keywords

sensoroptical propertiesnanostructure
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 1253: Symposium K – Functional Materials and Nanostructures for Chemical and Bochemical Sensing , 2010 , 1253-K10-26
Copyright
Copyright © Materials Research Society 2010

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