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3 May 2007 Optical micro-resonator chemical sensor
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Polymers that contain conjugated molecules can change their index of refraction upon bonding with high explosive molecules. These polymers can be incorporated into micro-ring resonators as trace explosive sensor. Since the resonator cavity itself is made of sensing material, the detection is intrinsic, which may lead to higher sensitivity and faster response than other fiber optic chemical sensors. Photobleaching was used for the fabrication of the microrings resonators. The sensor has shown ppb level of sensitivity to the vapor of an explosive stimulant 2,4- dinitrotoluene and is insensitive to common chemical pollutants including nitrates, sulfates and phosphates.
© (2007) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Anna Pyayt, Xuanqi Zhang, Jingdong Luo, Alex Jen, Larry Dalton, and Antao Chen "Optical micro-resonator chemical sensor", Proc. SPIE 6556, Micro (MEMS) and Nanotechnologies for Defense and Security, 65561D (3 May 2007);

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