Direct and sensitive phase readout for integrated waveguide sensors

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DOIResolve DOI: http://doi.org/10.1109/JPHOT.2013.2276747
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TypeArticle
Journal titleIEEE Photonics Journal
ISSN1943-0655
Volume5
Issue4
Article number6575104
SubjectAverage sensitivities; Conventional detection; Integrated optical sensors; Integrated waveguides; Intensity variations; Optical phase changes; Phase detection; Transmittance function; Chemical detection; Sensitivity analysis
AbstractIntegrated optical affinity sensors based on Mach-Zehnder interferometers (MZIs) enable sensitive and label-free detection of chemical and biological molecules. However, since MZIs transduce optical phase changes into sinusoidal intensity variations, they exhibit a variable sensitivity that vanishes at the extrema of the transmittance function. Moreover, the direction of phase change cannot be unambiguously determined with these sensors. Here, we present a coherent detection scheme based on integrated optics that enables unambiguous readout of the optical phase with a constant sensitivity. Our approach furthermore cancels the effect of imperfections in the sensor hardware using a blind calibration scheme. We experimentally show completely linear readout of the optical phase, with a fourfold enhancement of average sensitivity compared to conventional detection.
Publication date
LanguageEnglish
AffiliationInformation and Communication Technologies; National Research Council Canada
Peer reviewedYes
NPARC number21270440
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Record identifier5b81a947-f93f-4093-b1b2-fb10f98f4caf
Record created2014-02-11
Record modified2016-05-09
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