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, Amit Kumar Goyal, 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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