A biological sensor 10 having a beam/light shaper 30 which is adapted to inject light into the sensor at substantially the critical angle with respect to the side surface of the sensor. The sensor 10, of the preferred embodiment of the invention, further may undergo a surface treatment which reduces/eliminates...http://www.google.es/patents/US5952035?utm_source=gb-gplus-sharePatente US5952035 - Surface treatment and light injection method and apparatus
Surface treatment and light injection method and apparatus
