Integrated Optic Chemical-Biological Sensors
GEORGIA TECH RESEARCH INST ATLANTA
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Planar waveguides have evanescent fields sensitive to index of refraction changes in the volume immediately above the waveguide surface. Optically combining one guided sensing beam with a reference beam in an interferometric configuration generates measurable signals. Applying a chemically selective film over the sensing arm of the interferometer provides the basis for a chemical sensor. Tailored chemistries can be passive e.g. inducing swelling or dissolution in a film or active e.g. containing reactive or binding sites. Fast and reversible chemistries are the goal, in most cases for both gaseous and liquid applications. Passive mechanisms are used when the target analyte is relatively inert, i.e. aromatic and chlorinated hydrocarbons.
- Chemical, Biological and Radiological Warfare