Abstract
Remote-point photonic sensors are fabricated and evaluated. They are based on nanocomposite thin films comprising nanocrystals embedded in sol-gel silica matrix and are patterned using direct UV laser microetching techniques to form surface relief structures, which exhibit environment sensitive optical diffraction effects. A strong response to ammonia is detected via the alteration of diffraction efficiency of its orders upon exposure to the analyte. Detection of ammonia in the level with a typical response time of about in the ambient, 50% RH , room environment is demonstrated.
© 2010 Optical Society of America
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