Numerical investigation of a depressed-index core photonic crystal fiber for gas sensing

Y. L. Hoo, Wei Jin, J. Ju, H. L. Ho

Research output: Journal article publicationJournal articleAcademic researchpeer-review

25 Citations (Scopus)


A depressed-index core photonic crystal fiber (PCF) was numerically analyzed for gas sensing application. The dependence of relative sensitivity, effective mode area, confinement loss, and bend loss on the fiber parameters as well as wavelength are investigated. Lowering the refractive index of core reduces the index contrast between the core and the cladding weakens the index-guidance of the fiber, and enhances the relative sensitivity and the mode area simultaneously. Relative sensitivity and effective mode area increase with the cladding background index, especially in the short wavelength region, which are opposite to that in a conventional PCF. The enhancements of the relative sensitivity and the normalized effective mode area are more than 3700% (from 0.0065 to 0.25) and 680% (from 3.85 to 30), respectively, as compared with that of the non-depressed-index core PCF.
Original languageEnglish
Pages (from-to)460-465
Number of pages6
JournalSensors and Actuators, B: Chemical
Issue number2
Publication statusPublished - 4 Jun 2009


  • Bend loss
  • Evanescent field
  • Gas sensors
  • Mode area
  • Photonic crystal fibers
  • Relative sensitivity

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Instrumentation
  • Condensed Matter Physics
  • Surfaces, Coatings and Films
  • Metals and Alloys
  • Electrical and Electronic Engineering
  • Materials Chemistry


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