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Proceedings Paper

Air-suspended solid-core fibers for sensing
Author(s): S. Selleri; E. Coscelli; M. Sozzi; A. Cucinotta; F. Poli; D. Passaro
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Paper Abstract

Microstructured optical fibers have the potential to provide improved performance relative to more traditional spectroscopic fiber sensors. In fact the manipulation of the geometry of the fiber cross section can allow to maximize the interaction of light and sample. Recently, solid air-suspended core fibers have been appointed as the most promising design for evanescent field sensing. In this kind of device, sensing is carried out through the interaction between evanescent tails of index-guided modes and sample, which fills cladding holes. Suspended core fibers are made by three silica webs joining in the fiber center and forming the core. This design can provide an evanescent field power fraction greater than any other structure previously proposed, together with a wide transmission band. In this paper, the electromagnetic field behaviour of the guided modes of a range of suspended-core fibers is investigated, using a full-vectorial finite element based modal solver. The impact of different design parameters and materials on guidance, the amount of power in the cladding and the possibility of obtaining effective single-mode guidance are also investigated.

Paper Details

Date Published: 18 May 2009
PDF: 8 pages
Proc. SPIE 7356, Optical Sensors 2009, 73561L (18 May 2009); doi: 10.1117/12.820610
Show Author Affiliations
S. Selleri, Univ. degli Studi di Parma (Italy)
E. Coscelli, Univ. degli Studi di Parma (Italy)
M. Sozzi, Univ. degli Studi di Parma (Italy)
A. Cucinotta, Univ. degli Studi di Parma (Italy)
F. Poli, Univ. degli Studi di Parma (Italy)
D. Passaro, Univ. degli Studi di Parma (Italy)

Published in SPIE Proceedings Vol. 7356:
Optical Sensors 2009
Francesco Baldini; Jiri Homola; Robert A. Lieberman, Editor(s)

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