Dual polarisation biosensing with an SOI microring
نویسندگان
چکیده
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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