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Authors: J.F.I.B Hoste, S. Werquin, P. Bienstman
Title: Dual polarisation biosensing with an SOI microring
Format: International Conference Proceedings
Publication date: 11/2013
Journal/Conference/Book: Proceedings of the 18th Annual Symposium of the IEEE Photonics Society Benelux Chapter
Volume(Issue): p.113-116
Location: Eindhoven, Netherlands
Citations: Look up on Google Scholar
Download: Download this Publication (329KB) (329KB)


Optical microresonator biosensors have proven to be a valid tool for binding and affinity
analysis of a biological binding event. However, when these microresonators are excited
with a single optical mode they can not distinguish between a thin dense layer of
biomolecules or a thick sparse layer. We succeeded in exciting a Silicon-on-Insulator
(SOI) microring with both TE and TM polarisations simultaneously by using an asymmetrical
directional coupler. A theoretical model is provided to solve the shifts of these
modes to the thickness and refractive index of the biolayer. During a Bovine Serum Albumin
(BSA) adsorption experiment, both shifts were tracked, showing the potential of the
sensor for conformational analysis.

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