Virginia TechWang, ZhiyongHeflin, James R.Stolen, Rogers H.Ramachandran, Siddharth2014-03-142014-03-142005-04-01Zhiyong 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); doi: 10.1364/opex.13.0028081094-4087http://hdl.handle.net/10919/25932We 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.application/pdfenIn CopyrightFew-mode fibersArticle - Refereedhttp://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-13-8-2808https://doi.org/10.1364/opex.13.002808