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15 May 1998 New optical detection techniques for chemical sensors
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In this work we present three novel optical approaches towards the implementation of bio-and chemical sensors. First we describe an absorbance spectroscopic techniques developed on a waveguide platform that features a sensitivity enhancement of 4 orders of magnitude compared to the conventional transmission measurements of ultra-thin films. Next we show a waveguide Zeeman interferometric technique, which is based on the relative phase change between the TE and TM waveguide modes, applied as a sensor platform. Finally an external-cavity laser, a semiconductor laser combined with a single mode optical fiber and a Bragg grating reflector, was built to work as an active sensor where the analyte species were incorporated inside the resonant cavity to increase sensitivity.
© (1998) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Sergio Brito Mendes, Seppo Honkanen, Mahmoud Fallahi, and Nasser Peyghambarian "New optical detection techniques for chemical sensors", Proc. SPIE 3270, Methods for Ultrasensitive Detection, (15 May 1998);


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