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Applied Optics

Applied Optics


  • Editor: Joseph N. Mait
  • Vol. 48, Iss. 11 — Apr. 10, 2009
  • pp: 2171–2177

Research on testing the characteristics of hydrogel film by using a long-period fiber grating

Xiujuan Yu, Min Zhang, Paul Childs, Liwei Wang, Ming Lei, Yanbiao Liao, Jian Ju, and Win Jin  »View Author Affiliations

Applied Optics, Vol. 48, Issue 11, pp. 2171-2177 (2009)

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A method for testing the physical and optical properties of hydrogel thin films is reported based on using long-period fiber gratings. For humidity levels from 50% to 70% RH, a wavelength decrease of 11.0 nm is observed, with a sensitivity of 0.6 nm / % RH . For humidity levels from 70% to 98% RH, a wavelength increase of 6.3 nm is seen, with a sensitivity of 0.2 nm / % RH . For humidity levels greater than 60% RH, the transmission loss at resonance increases rapidly, showing a high degree of sensitivity of 0.5 dB / % RH . The blueshift of the wavelength was seen to be due to a thickening of the overlay, while the redshift of wavelength is due to the contribution of the drop in refractive index of the overlay. The results match well with what is expected theoretically.

© 2009 Optical Society of America

OCIS Codes
(060.2300) Fiber optics and optical communications : Fiber measurements
(060.2310) Fiber optics and optical communications : Fiber optics
(060.2370) Fiber optics and optical communications : Fiber optics sensors
(310.6860) Thin films : Thin films, optical properties

ToC Category:
Fiber Optic Sensors

Original Manuscript: January 7, 2009
Revised Manuscript: February 26, 2009
Manuscript Accepted: March 23, 2009
Published: April 7, 2009

Xiujuan Yu, Min Zhang, Paul Childs, Liwei Wang, Ming Lei, Yanbiao Liao, Jian Ju, and Win Jin, "Research on testing the characteristics of hydrogel film by using a long-period fiber grating," Appl. Opt. 48, 2171-2177 (2009)

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