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US 5,598,267 AGranted
Optical sensor for orthogonal radiation modes
AssigneeBritish Technology Group Limited
InventorsJohn R. Sambles, Guy P. Bryan-Brown
Life of this patent
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Abstract
An optical sensing device that incorporates either a surface plasmon-polariton or guided mode apparatus for converting radiation between s and p modes together with a sensor for detecting a maximum in conversion between the s and p modes.
Claims39
An apparatus for sensing polarization conversion in a coating layer on a diffraction grating having grating lines lying in a grating plane, said apparatus comprising:
- means for illuminating the coating with radiation at a first polarization, the direction of said first polarization and the direction of the grating lines being disposed at an angle with respect to one another in the grating plane, said angle being greater than 0.degree. and less than 90.degree.;
- means for receiving radiation reflected by the coating layer at a second polarization, said first polarization and said second polarization being disposed in radiation paths that are crossed with respect to one another;
- and
- means for sensing a maximum of received radiation reflected by the coating layer.
1 more element
Dependencies are inferred from the claim text.