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Virtual Journal for Biomedical Optics

Virtual Journal for Biomedical Optics


  • Editor: Gregory W. Faris
  • Vol. 2, Iss. 3 — Mar. 7, 2007

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, and Ian Bennion  »View Author Affiliations

Applied Optics, Vol. 46, Issue 4, pp. 451-455 (2007)

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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

OCIS Codes
(050.2770) Diffraction and gratings : Gratings
(060.2370) Fiber optics and optical communications : Fiber optics sensors

ToC Category:
Diffraction and Gratings

Original Manuscript: June 27, 2006
Revised Manuscript: September 27, 2006
Manuscript Accepted: October 3, 2006

Virtual Issues
Vol. 2, Iss. 3 Virtual Journal for Biomedical Optics

Xianfeng Chen, Kaiming Zhou, Lin Zhang, and Ian Bennion, "Dual-peak long-period fiber gratings with enhanced refractive index sensitivity by finely tailored mode dispersion that uses the light cladding etching technique," Appl. Opt. 46, 451-455 (2007)

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