Journal
OPTICS EXPRESS
Volume 24, Issue 14, Pages 15672-15686Publisher
OPTICAL SOC AMER
DOI: 10.1364/OE.24.015672
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Funding
- Natural Sciences and Engineering Research Council of Canada (NSERC)
- Div Of Chem, Bioeng, Env, & Transp Sys
- Directorate For Engineering [1264174] Funding Source: National Science Foundation
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While silicon photonic resonant cavities have been widely investigated for biosensing applications, enhancing their sensitivity and detection limit continues to be an area of active research. Here, we describe how to engineer the effective refractive index and mode profile of a silicon-on-insulator (SOI) waveguide using sub-wavelength gratings (SWG) and report on its observed performance as a biosensor. We designed a 30 mu m diameter SWG ring resonator and fabricated it using Ebeam lithography. Its characterization resulted in a quality factor, Q, of 7.10(3), bulk sensitivity S-b = 490 nm/RIU, and system limit of detection sLoD = 2.10(6) RIU. Finally, we employ a model biological sandwich assay to demonstrate its utility for biosensing applications. (C) 2016 Optical Society of America
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