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Ultra sensitive Bio-Chemical sensors Based on Optical Resonance

Published online by Cambridge University Press:  01 February 2011

Shalini Prasad
Shalini Prasad*
Affiliation:
sprasad@pdx.edu, Portland State Univerity, ECE, 160-11, FAB 1900 SW 4th Ave, Portland, OR, 97201, United States, 503-725-3223
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Abstract

With the focus on bio terrorism and environmental sensing, there is need for development of smart integrated bio-chemical sensors. We investigate Whispering Gallery Mode (WGM) based High Q micro cavity as a biosensor. We integrate the lab-on-a-chip approach with High Q technology to develop highly selective and smart sensors for in-situ detection of aqueous media based agents. We have investigated the ring based micro-cavity structure as a sensor. We identify the detection of agent through the changes observed in the wavelength shift and Q factor as a result of enzyme-substrate interactions. We report an experimental demonstration of a compact micro-cavity based biochemical sensor based on the micro ring structure. The micro-cavity, fabricated on a silica-on-silicon substrate, is designed to have a resonant wavelength (l) near 1.34 μm. The transmission spectrum of the sensor is measured with different ambient refractive indices ranging from n =1.0 to 1.5. Chemical detection was achieved by measuring the shift in resonant wavelength, and variation to the quality factor

Keywords

sensoropticalabsorption
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 890: Symposium Y – Surface Engineering for Manufacturing Applications , 2005 , 0890-Y06-05
Copyright
Copyright © Materials Research Society 2006

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