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Optical surface plasmon sensor device

  • US 4,844,613 A
  • Filed: 11/02/1987
  • Issued: 07/04/1989
  • Est. Priority Date: 11/03/1986
  • Status: Expired due to Fees
First Claim
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1. An optical sensor device, including a transparent body having a major surface on which a thin electrically conductive film is disposed, a light source fixed in position relative to the body and arranged to direct a divergent monochromatic light beam through the body to the surface whereby to achieve total internal reflection of the light from that surface and to excite surface plasmons in the conductive film, and an array of photodetectors arranged so as to detect the pattern of light reflected internally from the major surface whereby to determine the angle of incidence at that surface at which plasmon resonance occurs.

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