Photonic crystal waveguide based sensors

M. Askari; S. Yegnanarayanan; A. Adibi

doi:10.1117/12.881565

1 March 2011 Photonic crystal waveguide based sensors

M. Askari, S. Yegnanarayanan, A. Adibi

Proceedings Volume 7946, Photonic and Phononic Properties of Engineered Nanostructures; 794614 (2011) https://doi.org/10.1117/12.881565
Event: SPIE OPTO, 2011, San Francisco, California, United States

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.

Citation Download Citation

M. Askari, S. Yegnanarayanan, and A. Adibi "Photonic crystal waveguide based sensors", Proc. SPIE 7946, Photonic and Phononic Properties of Engineered Nanostructures, 794614 (1 March 2011); https://doi.org/10.1117/12.881565

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