Research Papers

Sensitivity enhancement in photonic crystal waveguide platform for refractive index sensing applications

[+] Author Affiliations
Hemant Sankar Dutta

Opto-electronic Devices Group, Central Electronics Engineering Research Institute, Pilani, 333 031 Rajasthan, India

Amit Kumar Goyal

Opto-electronic Devices Group, Central Electronics Engineering Research Institute, Pilani, 333 031 Rajasthan, India

Academy of Scientific and Innovative Research, New Delhi 110001, India

Suchandan Pal

Opto-electronic Devices Group, Central Electronics Engineering Research Institute, Pilani, 333 031 Rajasthan, India

Academy of Scientific and Innovative Research, New Delhi 110001, India

J. Nanophoton. 8(1), 083088 (Jun 03, 2014). doi:10.1117/1.JNP.8.083088
History: Received March 7, 2014; Revised April 23, 2014; Accepted May 14, 2014
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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 420nm/RIU.

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© 2014 Society of Photo-Optical Instrumentation Engineers

Citation

Hemant Sankar Dutta ; Amit Kumar Goyal and Suchandan Pal
"Sensitivity enhancement in photonic crystal waveguide platform for refractive index sensing applications", J. Nanophoton. 8(1), 083088 (Jun 03, 2014). ; http://dx.doi.org/10.1117/1.JNP.8.083088


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