Abstract
A photonic crystal (PhC) waveguide platform based on ring-shaped holes in a siliconon-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).
Original language | English (US) |
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Journal | Journal of Nanophotonics |
Volume | 8 |
Issue number | 1 |
DOIs | |
State | Published - Jan 1 2014 |
Externally published | Yes |
Bibliographical note
Generated from Scopus record by KAUST IRTS on 2023-10-12ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics