Local plasmon sensor using a gold colloid monolayer

Takayuki Okamoto; Tetsushi Kobayashi; Ichirou Yamaguchi

doi:10.1117/12.347736

7 May 1999 Local plasmon sensor using a gold colloid monolayer

Takayuki Okamoto, Tetsushi Kobayashi, Ichirou Yamaguchi

Proceedings Volume 3740, Optical Engineering for Sensing and Nanotechnology (ICOSN '99); (1999) https://doi.org/10.1117/12.347736
Event: Optical Engineering for Sensing and Nanotechnology (ICOSN '99), 1999, Yokohama, Japan

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.

Citation Download Citation

Takayuki Okamoto, Tetsushi Kobayashi, and Ichirou Yamaguchi "Local plasmon sensor using a gold colloid monolayer", Proc. SPIE 3740, Optical Engineering for Sensing and Nanotechnology (ICOSN '99), (7 May 1999); https://doi.org/10.1117/12.347736

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