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Proceedings Paper

Optical biosensors based on etched fiber Bragg gratings
Author(s): Mario Dagenais; A. N. Chryssis; Hyunmin Yi; Sang Mae Lee; S. S. Saini; William E. Bentley
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Paper Abstract

The need for efficient detection of biochemical agents is becoming more compelling. High sensitivity chemical and biological sensors, based on etched core fiber Bragg gratings that detect change in the index of refraction of surrounding solutions, were developed to measure the index of refraction of different solutions. A sensitivity of 1394 nm/riu was achieved for a core diameter of 3.4 μm. Assuming an experimental wavelength resolution of 0.01 nm, we were able to detect an index change of 7.2⋅10-6. These chemical sensors, properly sensitized using common glutaraldehyde chemistry, can be effectively used as biosensors. A 20 base single stranded DNA of concentration of 0.7 μg/ml was successfully detected. Some ideas are also proposed for sensitivity improvement of the sensor, like using the higher order modes. It is shown that the higher order modes can also provide information about the cause of the fundamental shift, whether it is due to refractive index change or due to external effects like temperature and stress.

Paper Details

Date Published: 25 March 2005
PDF: 11 pages
Proc. SPIE 5729, Optoelectronic Integrated Circuits VII, (25 March 2005); doi: 10.1117/12.591206
Show Author Affiliations
Mario Dagenais, Univ. of Maryland/College Park (United States)
A. N. Chryssis, Univ. of Maryland/College Park (United States)
Hyunmin Yi, Univ. of Maryland/College Park (United States)
Sang Mae Lee, Univ. of Maryland/College Park (United States)
S. S. Saini, Univ. of Maryland/College Park (United States)
William E. Bentley, Univ. of Maryland/College Park (United States)

Published in SPIE Proceedings Vol. 5729:
Optoelectronic Integrated Circuits VII
Louay A. Eldada; El-Hang Lee, Editor(s)

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