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Authors: T. Claes, W. Bogaerts, P. Bienstman
Title: Experimental characterization of a silicon photonic biosensor consisting of two cascaded ring resonators based on the Vernier-effect and introduction of a curve fitting method for an improved detection limit
Format: International Journal
Publication date: 10/2010
Journal/Conference/Book: Optics Express
Volume(Issue): 18(22) p.22747--22761
DOI: 10.1364/oe.18.022747
Citations: 172 (Web of Knowledge / Dimensions.ai - last update: 27/9/2020)
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Abstract

We studied a refractive index sensor that consists of two cascaded ring resonators and that works analogously to a Vernier-scale. We implemented it in silicon-on-insulator and experimentally determined its sensitivity to be as high as 2169nm/RIU in aqueous environment. We derived formulas describing the sensor’s operation, and introduced a fitting procedure that allows to accurately detect changes in the sensor response. We determined the detection limit of this first prototype to be 8.3*10−6RIU.

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