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Sensors

  • US 20080158563A1
  • Filed: 08/20/2007
  • Published: 07/03/2008
  • Est. Priority Date: 08/21/2006
  • Status: Abandoned Application
First Claim
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1. A gas sensor having a plasmon-polariton waveguide comprising a metal strip on a membrane supported by a substrate in an environment in which the gas to be sensed may be present, input means for coupling optical radiation into the plasmon-polariton waveguide such that the optical radiation propagates therealong as a plasmon-polariton wave and output means for receiving said optical radiation following said propagation, the metal strip comprising a chemical transducer, the arrangement being such that exposure of the chemical transducer to the gas to be sensed causes a change in the propagation characteristics of the plasmon-polariton wave propagating along the waveguide and hence a change in the optical radiation coupled out of the plasmon-polariton waveguide, the output means comprising means for monitoring for a change in said propagated optical radiation consistent with the presence of a prescribed level of the gas in the environment contacting the transducer.

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