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Optics Express

Optics Express

  • Editor: Michael Duncan
  • Vol. 13, Iss. 8 — Apr. 18, 2005
  • pp: 2808–2813

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

Zhiyong Wang, J. R. Heflin, Rogers H. Stolen, and Siddharth Ramachandran  »View Author Affiliations

Optics Express, Vol. 13, Issue 8, pp. 2808-2813 (2005)

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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-thick thin-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.

© 2005 Optical Society of America

OCIS Codes
(060.2340) Fiber optics and optical communications : Fiber optics components
(060.2370) Fiber optics and optical communications : Fiber optics sensors
(310.0310) Thin films : Thin films
(350.2770) Other areas of optics : Gratings

ToC Category:
Research Papers

Original Manuscript: February 28, 2005
Revised Manuscript: March 25, 2005
Published: April 18, 2005

Zhiyong Wang, J. Heflin, Rogers Stolen, and Siddharth Ramachandran, "Analysis of optical response of long period fiber gratings to nm-thick thin-film coating," Opt. Express 13, 2808-2813 (2005)

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