Empirical Model of Optical Sensing via Spectral Shift of Circular Bragg Phenomenon

Tom G. Mackay, Akhlesh Lakhtakia

Research output: Contribution to journalArticlepeer-review

Abstract

Setting up an empirical model of optical sensing to exploit the circular Bragg phenomenon displayed by chiral sculptured thin films (CSTFs), we considered a CSTF with and without a central twist defect of π/2 rad. The circular Bragg phenomenon of the defect-free CSTF and the spectral hole in the copolarized reflectance spectrum of the CSTF with the twist defect were both found to be acutely sensitive to the refractive index of a fluid that infiltrates the void regions of the CSTF. These findings bode well for the deployment of CSTFs as optical sensors.

Original languageEnglish
Pages (from-to)92-101
Number of pages10
JournalIeee photonics journal
Volume2
Issue number1
DOIs
Publication statusPublished - Feb 2010

Keywords

  • Engineered photonic nanostructures
  • optical and other properties
  • nanowires

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