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

A. S. Jugessur; M. Yagnyukova; J. Dou; J. S. Aitchison

doi:10.1117/12.908562

2 February 2012 Bragg-grating air-slot optical waveguide for label-free sensing

A. S. Jugessur, M. Yagnyukova, J. Dou, J. S. Aitchison

Proceedings Volume 8231, Nanoscale Imaging, Sensing, and Actuation for Biomedical Applications VIII; 82310N (2012) https://doi.org/10.1117/12.908562
Event: SPIE BiOS, 2012, San Francisco, California, United States

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.

Citation Download 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 (2 February 2012); https://doi.org/10.1117/12.908562

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