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:	263 (Dimensions.ai - last update: 24/11/2024) 130 (OpenCitations - last update: 3/5/2024) Look up on Google Scholar
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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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