Simultaneous retrieval of fluidic refractive index and surface adsorbed molecular film thickness using silicon wire waveguide biosensors

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DOIResolve DOI: http://doi.org/10.1364/OE.20.026969
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TypeArticle
Journal titleOptics Express
ISSN1094-4087
Volume20
Issue24
Pages2696926977; # of pages: 9
AbstractFor silicon wire based ring resonator biosensors, we investigate the simultaneous retrieval of changes in the fluidic refractive index Δn c and surface adsorbed molecular film thickness ΔdF. This can be achieved by monitoring the resonance shifts of the sensors operating in the TE and TM polarizations at the same time. Although this procedure is straightforward in principle, significant retrieval errors can be introduced due to deviations in the sensor waveguide cross-sections from their nominal values in the range commonly encountered for silicon photonic wire devices. We propose a method of determining the fabricated waveguide size using the group indices derived from measured free spectral range (FSR) of the resonators. We further demonstrate that using experimentally measured group index values, the waveguide size can be determined to accuracies of ± 2 nm in width and ± 1 nm in height. By using this procedure, Δn c and ΔdF can be obtained to a precision of within 10% of the true values using optically measurable parameters, improving the retrieval accuracy by more than 3 times.
Publication date
LanguageEnglish
AffiliationInformation and Communication Technologies; National Research Council Canada
Peer reviewedYes
NPARC number21270149
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Record identifier593928fd-2209-4c37-a3b3-e5f1d8f28b59
Record created2014-01-06
Record modified2016-05-09
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