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Title: Research on testing the characteristics of hydrogel film by using a long-period fiber grating
Authors: Yu, X
Zhang, M
Childs, P
Wang, L
Lei, M
Liao, YB
Ju, J
Jin, W 
Keywords: Diffraction gratings
Fiber Bragg gratings
Fiber lasers
Refractive index
Issue Date: 10-Apr-2009
Publisher: Optical Society of America
Source: Applied optics, 10 Apr. 2009, v. 48, no. 11, p. 2171-2177 How to cite?
Journal: Applied optics 
Abstract: 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 0.6nm/%RH. For humidity levels from 70% to 98% RH, a wavelength increase of 6.3nm is seen, with a sensitivity of 0.2nm/%RH. For humidity levels greater than 60% RH, the transmission loss at resonance increases rapidly, showing a high degree of sensitivity of 0.5dB/%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.
ISSN: 0003-6935
DOI: 10.1364/AO.48.002171
Rights: © 2009 Optical Society of America. This paper was published in Applied Optics and is made available as an electronic reprint with the permission of OSA. The paper can be found at the following URL on the OSA website: Systematic or multiple reproduction or distribution to multiple locations via electronic or other means is prohibited and is subject to penalties under law.
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