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Proceedings Paper

Bragg-grating air-slot optical waveguide for label-free sensing
Author(s): A. S. Jugessur; M. Yagnyukova; J. Dou; J. S. Aitchison
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Paper Abstract

The development of miniature and label-free optical sensors is very critical for applications in a wide range of areas such as medicine, environment, forensic and food quality control. In this report, a Bragg-grating air-slot waveguide is designed (using Finite Domain Time Difference modeling (FDTD)) and fabricated (using Electron beam lithography and Reactive ion etching) on a silicon-on-insulator substrate to develop a label-free optical sensor. The Bragg gratings constitute of recesses in the 140 nm wide air-slot waveguide. The grating structures generate a band-gap for certain frequencies and the spectral shift of the lower band-edge is used as the mechanism to sense fluids or bio-molecules in the air-slot. Based on the 3-D FDTD and experimental results, the sensitivity of the device is 620 nm/RIU, which is higher than other recently reported sensors. Due to the high electric field intensity in the air slot, this area becomes very sensitive to index variations caused by bio-molecules or fluids in the air-slot.

Paper Details

Date Published: 2 February 2012
PDF: 4 pages
Proc. SPIE 8231, Nanoscale Imaging, Sensing, and Actuation for Biomedical Applications VIII, 82310N (2 February 2012); doi: 10.1117/12.908562
Show Author Affiliations
A. S. Jugessur, Univ. of Toronto (Canada)
M. Yagnyukova, Univ. of Toronto (Canada)
J. Dou, Univ. of Toronto (Canada)
J. S. Aitchison, Univ. of Toronto (Canada)


Published in SPIE Proceedings Vol. 8231:
Nanoscale Imaging, Sensing, and Actuation for Biomedical Applications VIII
Alexander N. Cartwright; Dan V. Nicolau, Editor(s)

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