Double Resonant Vertically Accessed Optical Waveguide Sensor

Anat Demeter-Finzi, Shlomo Ruschin*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

3 Scopus citations


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.

Original languageEnglish
Article number9171905
Pages (from-to)1478-1484
Number of pages7
JournalIEEE Sensors Journal
Issue number2
StatePublished - 15 Jan 2021


  • Grating couplers
  • interferometry
  • optical sensors
  • vertical coupling
  • waveguides


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