| 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
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Abstract
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. Related Research Topics
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