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Sol-Gel-Based Integrated Optical Microring Resonator Humidity Sensor

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4 Author(s)
Bhola, B. ; Ming Hsieh Dept. of Electr. Eng., Univ. of Southern California, Los Angeles, CA ; Nosovitskiy, P. ; Mahalingam, H. ; Steier, William H.

A novel humidity sensor based on sol-gel clad polymer microring resonator is presented. This sensor is based on the principle of change in refractive index of sol-gel on exposure to moisture. This change causes a shift in the resonant wavelength of the microring resonator. The performance of this sensor is analyzed and different ways of tailoring the sensor response are suggested. This sensor has a sensitivity of 16 pm/% relative humidity (RH) and a dynamic range up to 72% RH. The response time of this sensor can be tailored to be less than 200 ms, which could be utilized for monitoring human breathing condition in medical applications.

Published in:

Sensors Journal, IEEE  (Volume:9 ,  Issue: 7 )

Date of Publication:

July 2009

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