The present invention describes (bio)chemo-functional waveguide grating structures consisting of at least one (bio)chemo-functional waveguide grating structure unit or at least one (bio)chemo-functional sensor location with beam guidance permitting light beam separation, as well as detection methods...http://www.google.com.au/patents/US7627201?utm_source=gb-gplus-sharePatent US7627201 - Waveguide grating structure and optical measurement arrangement
