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Double Resonant Vertically Accessed Optical Waveguide Sensor
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DOI：10.1109/JSEN.2020.3018231.png)
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Abstract
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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.
Keywords:
Optical waveguides
Sensitivity
Gratings
Interference
Optical resonators
Optical sensors
Grating couplers
interferometry
optical sensors
vertical coupling
waveguides
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