Open AccessPhotonic-crystal fiber as a multifunctional optical sensor and sample collector
Author(s) -
S. O. Konorov,
А. М. Желтиков,
Michael Scalora
Publication year - 2005
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/opex.13.003454
Subject(s) - materials science , photonic crystal fiber , optics , cladding (metalworking) , optical fiber , all silica fiber , optoelectronics , laser , photonic crystal , refractive index , graded index fiber , total internal reflection , plastic optical fiber , photonics , fiber laser , fiber optic sensor , physics , metallurgy
Two protocols of optical sensing realized with the same photonic-crystal fiber are compared. In the first protocol, diode-laser radiation is delivered to a sample through the central core of a dual-cladding photonic-crystal fiber with a diameter of a few micrometers, while the large-diameter fiber cladding serves to collect the fluorescent response from the sample and to guide it to a detector in the backward direction. In the second scheme, liquid sample is collected by a microcapillary array in the fiber cladding and is interrogated by laser radiation guided in the fiber modes. For sample fluids with refractive indices exceeding the refractive index of the fiber material, fluid channels in photonic-crystal fibers can guide laser light by total internal reflection, providing an 80% overlap of interrogating radiation with sample fluid.