Sub-wavelength grating for enhanced ring resonator biosensor

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...

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Bibliographic Details
Published in:Optics express Vol. 24; no. 14; pp. 15672 - 15686
Main Authors: Flueckiger, Jonas, Schmidt, Shon, Donzella, Valentina, Sherwali, Ahmed, Ratner, Daniel M., Chrostowski, Lukas, Cheung, Karen C.
Format: Journal Article
Language:English
Published: United States 11.07.2016
Subjects:
Biosensing Techniques - instrumentation
Equipment Design
Limit of Detection
Optics and Photonics
Photons
Refractometry
Silicon
ISSN:1094-4087, 1094-4087
Online Access:Get full text
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Summary: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 μm diameter SWG ring resonator and fabricated it using Ebeam lithography. Its characterization resulted in a quality factor, Q, of 7 · 10 , bulk sensitivity Sb = 490 nm/RIU, and system limit of detection sLoD = 2 · 10 RIU. Finally we employ a model biological sandwich assay to demonstrate its utility for biosensing applications.
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ISSN:1094-4087
1094-4087
DOI:10.1364/OE.24.015672