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Proceedings Paper

Evanescent-wave LPFG in D-fiber by periodically patterned overlay
Author(s): G. Quero; A. Crescitelli; D. Paladino; M. Consales; A. Buosciolo; M. Giordano; A. Cusano
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Paper Abstract

Long-period fiber gratings (LPFGs) represent an attractive fiber grating-based technological platform because of their selective spectral features together with the intrinsic sensitivity to surrounding refractive index (SRI). Unfortunately, their main limitation relies on the necessity to opportunely coat the glass substrate when sensitivity enhancement and/or specific functionalization are required. Here, we investigate the possibility to realize a self-functionalized and high-sensitivity LPFG by evanescent-wave interaction of the propagating light with a periodically patterned overlay. In particular, a D-shaped optical fiber is considered because of its peculiar geometrical features. First chemical etching is used to allow the evanescent-wave interaction of the propagating light with the surroundings with the desired sensitivity. Successively a uniform atactic polystyrene overlay is deposited onto the flat surface of the structure by dip-coating technique. Finally the overlay is opportunely patterned by laser-micromachining techniques in order to create a LPFG-like structure. The reported results demonstrate the spectral features of the realized device and confirm the LPFG-like behavior with high SRI-sensitivity. The flexibility of the adopted fabrication method could allow the realization of innovative LPFGs to be adopted for a multitude of sensing applications, depending on the nature of the material deposited onto the flat surface of the etched D-fiber.

Paper Details

Date Published: 9 September 2010
PDF: 4 pages
Proc. SPIE 7653, Fourth European Workshop on Optical Fibre Sensors, 76531G (9 September 2010); doi: 10.1117/12.866335
Show Author Affiliations
G. Quero, Univ. degli Studi del Sannio (Italy)
A. Crescitelli, Univ. degli Studi del Sannio (Italy)
D. Paladino, Univ. degli Studi del Sannio (Italy)
M. Consales, Univ. degli Studi del Sannio (Italy)
A. Buosciolo, National Research Council (Italy)
M. Giordano, National Research Council (Italy)
A. Cusano, Univ. degli Studi del Sannio (Italy)


Published in SPIE Proceedings Vol. 7653:
Fourth European Workshop on Optical Fibre Sensors
José Luís Santos; Brian Culshaw; José Miguel López-Higuera; William N. MacPherson, Editor(s)

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