Investigation of a periodically segmented waveguide Fabry-Pérot interferometer for use as a chemical/biosensor

Noam Kinrot, Menachem Nathan

Research output: Contribution to journalArticlepeer-review


We present a periodically segmented waveguide Fabry-Pérot interferometer (PSW-FPI) intended to be used for tagless real-time chemical/biological sensing through bulk-material interaction. The differential sensor detects changes in the refractive index (RI) of a sample regardless of its absolute RI value. Experiments with a series of sucrose solutions of various concentrations are compared with theoretical results, and a very good match is found between the two. The theoretical sensitivity limit for a 50-dB-signal-to-noise-ratio (SNR) measurement system is estimated as δn = 3 · 10-7. For a 29-dB-SNR measurement system, a measured sensitivity limit of δn = 4 · 10-5 is comparable with the previously reported sensitivities of label-free real-time optical biosensors (2 · 10-5-5 · 10-5). However, the total required sensing length (720 μm) of our PSW-FPI sensor is much shorter than that of the previously reported devices (9-20 mm).

Original languageEnglish
Pages (from-to)2139-2145
Number of pages7
JournalJournal of Lightwave Technology
Issue number5
StatePublished - May 2006


  • Fabry-Pérot interferometer (FPI)
  • One-dimensional photonic bandgap (1-D-PBG)
  • Periodically segmented waveguide (PSW)
  • SU8
  • Unbalanced Mach-Zehnder structure (uMZ)


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