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

Hemant Sankar Dutta, Amit Kumar Goyal, Suchandan Pal

Research output: Contribution to journalArticlepeer-review

25 Scopus citations


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 languageEnglish (US)
JournalJournal of Nanophotonics
Issue number1
StatePublished - Jan 1 2014
Externally publishedYes

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics


Dive into the research topics of 'Sensitivity enhancement in photonic crystal waveguide platform for refractive index sensing applications'. Together they form a unique fingerprint.

Cite this