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Applied Optics

Applied Optics


  • Vol. 27, Iss. 6 — Mar. 15, 1988
  • pp: 1160–1163

Optical chemical sensor based on surface plasmon measurement

Koji Matsubara, Satoshi Kawata, and Shigeo Minami  »View Author Affiliations

Applied Optics, Vol. 27, Issue 6, pp. 1160-1163 (1988)

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A new optical chemical sensor was developed for chemical sensing based on light-excited surface plasmon measurement. Concentration of the chemical species is found in liquid or gas without the help of a reagent but by measuring the resonance condition of the surface plasmon on the sensing metal surface. The resonance condition is given by the dielectric constant of the sample faced on the metal. The developed sensor can be compact and simple, because of the absence of mechanical moving parts, by using multichannel angular light intensity detection with a photodiode array and a Fourier transform optical setup. Experimental results are shown for measurement of ethanol concentration in water. The detection limit for ethanol in water was 10−4 wt./wt. by the experiments with the developed system.

© 1988 Optical Society of America

Original Manuscript: August 27, 1987
Published: March 15, 1988

Koji Matsubara, Satoshi Kawata, and Shigeo Minami, "Optical chemical sensor based on surface plasmon measurement," Appl. Opt. 27, 1160-1163 (1988)

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