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Proceedings Article

Bragg-grating air-slot optical waveguide for label-free sensing

[+] Author Affiliations
A. S. Jugessur, M. Yagnyukova, J. Dou, J. S. Aitchison

Univ. of Toronto (Canada)

Proc. SPIE 8231, Nanoscale Imaging, Sensing, and Actuation for Biomedical Applications VIII, 82310N (February 1, 2012); doi:10.1117/12.908562
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From Conference Volume 8231

  • Nanoscale Imaging, Sensing, and Actuation for Biomedical Applications VIII
  • Alexander N. Cartwright; Dan V. Nicolau
  • San Francisco, California, USA | January 21, 2012

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.© (2012) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Citation

A. S. Jugessur ; M. Yagnyukova ; J. Dou and J. S. Aitchison
"Bragg-grating air-slot optical waveguide for label-free sensing", Proc. SPIE 8231, Nanoscale Imaging, Sensing, and Actuation for Biomedical Applications VIII, 82310N (February 1, 2012); doi:10.1117/12.908562; http://dx.doi.org/10.1117/12.908562


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