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Proceedings Paper

Local plasmon sensor using a gold colloid monolayer
Author(s): Takayuki Okamoto; Tetsushi Kobayashi; Ichirou Yamaguchi
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Paper Abstract

A new optical sensor using local plasmon resonance is proposed. The sensor uses the principle that the extinction efficiency of a small metal particle depends on the effective refractive index of the medium surrounding the particle. We use gold colloid monolayers for the sensor, in which colloidal gold particles of 16-nm diameter are immobilized on a glass slide using functional organic coupling agent. We measured absorption spectra of the gold colloid monolayers immersed in liquid samples and coated with film samples. In the experiments for poly-(methyl methacrylate acid) films we obtained the thickness sensitivities of 0.009 absorbance/nm and 4.3 nm/nm for peak absorbance and for resonance wavelength, respectively.

Paper Details

Date Published: 7 May 1999
PDF: 4 pages
Proc. SPIE 3740, Optical Engineering for Sensing and Nanotechnology (ICOSN '99), (7 May 1999); doi: 10.1117/12.347736
Show Author Affiliations
Takayuki Okamoto, RIKEN--The Institute of Physical and Chemical Research (Japan)
Tetsushi Kobayashi, Gakushuin Univ. (Japan)
Ichirou Yamaguchi, RIKEN--The Institute of Physical and Chemical Research (Japan)

Published in SPIE Proceedings Vol. 3740:
Optical Engineering for Sensing and Nanotechnology (ICOSN '99)
Ichirou Yamaguchi, Editor(s)

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