3 June 2014 Sensitivity enhancement in photonic crystal waveguide platform for refractive index sensing applications
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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 .
© 2014 Society of Photo-Optical Instrumentation Engineers (SPIE)
Hemant Sankar Dutta, Hemant Sankar Dutta, Amit Kumar Goyal, Amit Kumar Goyal, Suchandan Pal, Suchandan Pal, } "Sensitivity enhancement in photonic crystal waveguide platform for refractive index sensing applications," Journal of Nanophotonics 8(1), 083088 (3 June 2014). https://doi.org/10.1117/1.JNP.8.083088 . Submission:
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