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Authors: S. Werquin, S. Verstuyft, P. Bienstman
Title: Integrated interferometric approach to solve microring resonance splitting in biosensor applications
Format: International Journal
Publication date: 7/2013
Journal/Conference/Book: Optics Express
Volume(Issue): 21(14) p.16955-16963
DOI: 10.1364/oe.21.016955
Citations: 15 ( - last update: 14/7/2024)
15 (OpenCitations - last update: 27/6/2024)
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Silicon-on-insulator microring resonators have proven to be an
excellent platform for label-free nanophotonic biosensors. The high index
contrast of silicon-on-insulator allows for fabrication of micrometer-size
sensors. However, it also limits the quality of the resonances by introducing
an intrinsic mode-splitting. Backscattering of optical power at small
waveguide variations lifts the degeneracy of the normal resonator modes.
This severely deteriorates the quality of the output signal, which is of
utmost importance to determine the performance of the microrings as a
biosensor. We suggest an integrated interferometric approach to give access
to the unsplit, high-quality normal modes of the microring resonator and
experimentally show an improvement of the quality factor by a factor of 3.

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