A microoptical sensor and a corresponding method for detecting chemical substances in a sample. The sample is brought into contact with the waveguiding layer of a planar optical waveguide. Coherent light is coupled into the waveguiding layer, propagates therein as a guided wave, and the latter is decoupled...http://www.google.com.au/patents/US5455178?utm_source=gb-gplus-sharePatent US5455178 - Microoptical sensor and method
