Double Resonant Vertically Accessed Optical Waveguide Sensor

We present a new waveguided-sensing configuration combining the advantages of two effects, namely, two-wave interference and multiple-wave interference in a single sensing device. The sensor is accessed vertically from above by means of a three-port grating, and its readout can be accomplished both...

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Bibliographic Details
Published inIEEE sensors journal Vol. 21; no. 2; pp. 1478 - 1484
Main Authors Demeter-Finzi, Anat, Ruschin, Shlomo
Format Journal Article
LanguageEnglish
Published New York IEEE 15.01.2021
The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subjects
Grating couplers
Gratings
Interference
interferometry
Optical resonators
Optical sensors
Optical waveguides
Parameter sensitivity
Sensitivity
Sensitivity enhancement
Sensors
vertical coupling
waveguides
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Summary:We present a new waveguided-sensing configuration combining the advantages of two effects, namely, two-wave interference and multiple-wave interference in a single sensing device. The sensor is accessed vertically from above by means of a three-port grating, and its readout can be accomplished both in an up-reflective or waveguided mode. The superposition of the two outcoming signals results in a variety of transmission characteristic curves depending on fabrication parameters, which are optimized in order to attain enhanced sensitivity. The sensor analyzed by means of a simple scattering matrix model and confirmed by full FDTD simulations.
ISSN:1530-437X
1558-1748
DOI:10.1109/JSEN.2020.3018231