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Proceedings Paper

Photonic crystal waveguide based sensors
Author(s): M. Askari; S. Yegnanarayanan; A. Adibi
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Paper Abstract

Waveguide based sensors allow independent control over sensitivity and dynamic range, which is not possible in resonance based sensors. In this paper, we present a refractive index sensor based on using photonic crystal waveguides (PCWs) in an unbalanced Mach-Zehnder interferometer configuration. In this configuration the dynamic range of the sensor is determined by the path difference between the two arms and the sensitivity is controlled by the length of the PCW. We show that by using PCWs we can get a factor of 8 improvement in sensitivity over a ridge-waveguide based sensor. This enhanced sensitivity is achieved due to reduced group velocity in a PCW. By reducing the loss at low group velocities the sensitivity can be further improved.

Paper Details

Date Published: 1 March 2011
PDF: 8 pages
Proc. SPIE 7946, Photonic and Phononic Properties of Engineered Nanostructures, 794614 (1 March 2011); doi: 10.1117/12.881565
Show Author Affiliations
M. Askari, Georgia Institute of Technology (United States)
S. Yegnanarayanan, Georgia Institute of Technology (United States)
A. Adibi, Georgia Institute of Technology (United States)

Published in SPIE Proceedings Vol. 7946:
Photonic and Phononic Properties of Engineered Nanostructures
Ali Adibi; Shawn-Yu Lin; Axel Scherer, Editor(s)

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