Wide-Range Refractometric Sensor Using Differently Sensitive Y-Branched Waveguides

A surface sensor rendering an extended detection range was proposed and demonstrated, taking advantage of a Y-branch structure. The sensing and reference waveguides, comprising the Y-branch structure, were overlaid with TiO 2 films of different thicknesses; thus, they show unequal sensitivities. The...

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Bibliographic Details
Published in:Japanese Journal of Applied Physics 2012-01, Vol.51 (1R), p.12202
Main Authors: Son, Geun-Sik, Kim, Woo-Kyung, Lee, Sang-Shin, Park, Soon-Sup, Lee, Daewon, Park, Jun-Hee, Kwon, Soon Woo, Sim, Jae-Hwan, Lee, Han-Young
Format: Article
Language:English
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Summary:A surface sensor rendering an extended detection range was proposed and demonstrated, taking advantage of a Y-branch structure. The sensing and reference waveguides, comprising the Y-branch structure, were overlaid with TiO 2 films of different thicknesses; thus, they show unequal sensitivities. The phase change experienced by the two waveguides was in situ monitored through a birefringence analyzer. The interference number for the sensing waveguide was derived from the response of the reference waveguide. The implemented sensor was evaluated by varying the concentration of glucose solution, confirming that the proposed sensing scheme is useful for efficiently extending the detection range.
ISSN:0021-4922
1347-4065
DOI:10.1143/JJAP.51.012202