18 May 2009 Perfluorinated polymer optical fiber tapers for fluorescence collection
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We propose the use of perfluorinated cladded multimode polymer optical fibers tapers for fluorescent detection in aqueous environment. A graded-index polymer optical fiber with core and cladding diameters of 62.5/90 and very low refractive index (nCore = 1.356, nCladding = 1.342) has been used. The taper has been fabricated using the heat-and- pull technique. Despite to the fact that taper core is not in direct contact with the external medium, this fiber taper can be used for sensing applications. In fact, some of the guided modes are no more confined in the core region but can still be guided by the fiber in the cladding region. Therefore, in the taper region, there is an evanescent wave in the external medium, related to the cladding modes. The taper geometry and the very low refractive index of the material corecladding (1,35-1,34) permits a strong enhancement of the penetration depth increasing the fluorescence collection efficiency in aqueous environments (1.33). Fluorescence measurements in an aqueous solution containing Cy5 dye in a concentration range 3.14×10-7M to 6.76×10-6M have been performed.
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Roberto Gravina, Roberto Gravina, Genni Testa, Genni Testa, Romeo Bernini, Romeo Bernini, } "Perfluorinated polymer optical fiber tapers for fluorescence collection", Proc. SPIE 7356, Optical Sensors 2009, 735616 (18 May 2009); doi: 10.1117/12.820700; https://doi.org/10.1117/12.820700

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