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    Analysis of optical response of long period fiber gratings to nm-thick thin-film coatings

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    Downloads: 216
    Date
    2005-04-01
    Author
    Wang, Z. Y.
    Heflin, James R.
    Stolen, R. H.
    Ramachandran, S.
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    Abstract
    We have theoretically and experimentally demonstrated that the resonant wavelength of long period fiber gratings (LPG) can be shifted by a large magnitude by coating with only a nm-thickthin-film that has a refractive index higher than that of the glass cladding. The resonant wavelength shift can result from either the variation of the thickness of the film and/or the variation of its refractive index. These results demonstrate the sensitivity of LPG-based sensors can be enhanced by using a film of nm-thickness and refractive index greater than silica. This coating schematic offers an efficient platform for achieving high-performance index-modulating fiber devices and high-performance index/thickness-sensing LPG-based fiber sensors for detecting optical property variations of the thin-film coating. (C) 2005 Optical Society of America.
    URI
    http://hdl.handle.net/10919/25932
    Collections
    • Scholarly Works, Department of Physics [811]
    • Scholarly Works, Electrical and Computer Engineering [538]

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