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Related Experiment Video

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Implementation of a Reference Interferometer for Nanodetection

Implementation of a Reference Interferometer for Nanodetection

Published on: April 26, 2014

Integrated interferometric approach to solve microring resonance splitting in biosensor applications.

Sam Werquin¹, Steven Verstuyft, Peter Bienstman

¹Photonics Research Group, INTEC Department, Ghent University - imec, Sint-Pietersnieuwstraat 41, 9000 Gent, Belgium.

|August 14, 2013

Summary

Silicon-on-insulator microring resonators are key for biosensors, but suffer from mode-splitting. An integrated interferometric approach improves their quality factor by 3x, enhancing biosensing performance.

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Last Updated: May 8, 2026

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Area of Science:

Nanophotonics
Biosensing
Optical Resonators

Background:

Silicon-on-insulator (SOI) microring resonators are widely used for label-free biosensing due to their small size and high index contrast.
However, intrinsic mode-splitting caused by backscattering in SOI waveguides degrades resonator quality and limits biosensor performance.

Purpose of the Study:

To develop a method for accessing the intrinsic, unsplit modes of SOI microring resonators.
To improve the signal quality and performance of SOI microring resonators for biosensing applications.

Main Methods:

An integrated interferometric approach was designed and implemented.
The performance of the integrated system was experimentally evaluated.

Main Results:

The integrated interferometric approach successfully provided access to the unsplit normal modes of the microring resonator.
An improvement in the quality factor (Q-factor) of the microring resonators by a factor of 3 was experimentally demonstrated.

Conclusions:

The proposed interferometric method effectively overcomes the limitations of mode-splitting in SOI microring resonators.
This enhancement significantly improves the quality of the output signal, paving the way for more sensitive and reliable nanophotonic biosensors.