Patent ID: 6429022
Filing Date: 2002-08-06
Classification: G01N

Abstract:
An integrated-optical chemical and/or biochemical sensor comprising:a resonant waveguide grating structure defining a surface plane; a sensing area arranged in the immediate vicinity of the resonant waveguide grating structure and adapted for being contacted by a liquid substance; means for emitting electromagnetic radiation towards the resonant waveguide grating structure; the means for emitting electromagnetic radiation comprising means for varying at least one parameter of the emitted electromagnetic radiation; the mutual arrangement of the resonant waveguide grating structure and the means for emitting electromagnetic radiation being such that the angles of incidence with respect to a normal line on said surface plane are greater than âˆ’90Â° and smaller than +90Â°, and detector means for detecting electromagnetic radiation excident from the resonant waveguide grating structure; the mutual arrangement of the resonant waveguide grating structure and the detector means being such that the angles of excidence with respect to a normal line on said surface plane are greater than âˆ’90Â° and smaller than +90Â°, and differ from the angles of incidence.