Journal
MEASUREMENT SCIENCE AND TECHNOLOGY
Volume 17, Issue 7, Pages 1752-1756Publisher
IOP PUBLISHING LTD
DOI: 10.1088/0957-0233/17/7/013
Keywords
high sensitivity; evanescent field; Bragg grating; open top ridge waveguide; polarization insensitive; mode conversion; refractometer
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A highly sensitive waveguide Bragg grating (WBG) sensor for measuring small changes of the refractive index of the surrounding liquid is presented. By using an open top ridge waveguide with a small core, the evanescent field interaction of the guided mode with the liquid analyte on the top of the waveguide is enhanced. The sensitivity measured via a shift in the resonance wavelength of the Bragg grating as high as 1 pm of wavelength shift for a change of 4 x 10(-5) in the refractive index around 1.402 is realized. With a polarization insensitive Bragg grating, the polarization dependence of the sensor is improved. A theoretical analysis for the sensitivity of ridge waveguide sensors is given. The experimental results are in good agreement with the theoretical analysis.
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