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Journal of Nanophotonics

Sensitivity enhancement in photonic crystal waveguide platform for refractive index sensing applications
Author(s): Hemant Sankar Dutta; Amit Kumar Goyal; Suchandan Pal
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Paper Abstract

A photonic crystal (PhC) waveguide platform based on ring-shaped holes in a silicon-on-insulator substrate is proposed in order to realize a refractive index sensor with an improved sensitivity. The three-dimensional finite-difference time domain method is used to analyze the proposed design. The sensitivity is estimated by measuring the shift in the upper band-edge of the output transmission spectrum. Sensitivity analysis of a conventionally designed PhC waveguide, followed by modification of the structure, has been carried out for improving the sensitivity by introducing a row of holes that forms the line defect. Further improvement in sensitivity is obtained by replacing the defect row of holes by ring-shaped holes, which shows a significantly high sensitivity along with considerable output signal strength. The optimized design shows a wavelength shift of 210 nm for a change in ambient refractive index from air (RI=1 ) to xylene (RI=1.5 ), corresponding to an average sensitivity of 420  nm/RIU .

Paper Details

Date Published: 3 June 2014
PDF: 6 pages
J. Nanophoton. 8(1) 083088 doi: 10.1117/1.JNP.8.083088
Published in: Journal of Nanophotonics Volume 8, Issue 1
Show Author Affiliations
Hemant Sankar Dutta, CSIR-Madras Complex (India)
Amit Kumar Goyal, CSIR-Madras Complex (India)
Academy of Scientific and Innovative Research (India)
Suchandan Pal, CSIR-Madras Complex (India)
Academy of Scientific and Innovative Research (India)

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