Dual-peak long-period fiber gratings with enhanced refractive index sensitivity by finely tailored mode dispersion that uses the light cladding etching technique

Xianfeng Chen*, Kaiming Zhou, Lin Zhang, Ian Bennion

*Corresponding author for this work

Research output: Contribution to journalArticle

Abstract

We have experimentally investigated the mode dispersion property and refractive index sensitivity of dual-peak long-period fiber gratings (LPGs) that were sensitized by hydrofluoric acid (HF) etching. The nature of the coupled cladding modes close to the dispersion turning point makes the dual-peak LPGs ultrasensitive to cladding property, permitting a fine tailoring of the mode dispersion and index sensitivity by the light cladding etching method using HF acid of only 1% concentration. As an implementation of an optical biosensor, the etched device was used to detect the concentration of hemoglobin protein in a sugar solution, showing a sensitivity as high as 20 nm/1%. © 2007 Optical Society of America.

Original languageEnglish
Pages (from-to)451-455
Number of pages5
JournalApplied Optics
Volume46
Issue number4
DOIs
Publication statusPublished - Feb 2007

Keywords

  • mode dispersion
  • refractive index sensitivity
  • dual-peak long-period fiber gratings
  • LPGs
  • sensitized
  • hydrofluoric acid etching
  • coupled cladding modes
  • dispersion turning point
  • cladding property
  • light cladding etching
  • cocentration
  • hemoglobin protein
  • sugar solution

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