Abstract

Remote-point photonic sensors are fabricated and evaluated. They are based on nanocomposite thin films comprising NiCl2 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 2ppm level with a typical response time of about 30s in the ambient, 50% RH 20°C, room environment is demonstrated.

© 2010 Optical Society of America

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