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Optical Engineering

Metal-clad optical waveguide fluorescence device for the detection of heavy metal ions
Author(s): Giancarlo Margheri; Emilia Giorgetti; Paolo Marsili; Angela Zoppi; Luisa Lascialfari; Stefano Cicchi
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Paper Abstract

We developed Hg 2+ -sensing chips by decorating the external surface of metal-clad optical waveguides with a monolayer of Hg 2+ -sensitive fluorescent molecular probes. The emission properties of the original water-soluble form of the molecule were previously found to be selectively quenched in the presence of Hg 2+ ions. The fabricated samples were tested with optical waveguide fluorescence spectroscopy by putting them in contact with a 5-μM water solution of Hg 2+ ions and recording the emission spectra versus incubation time. The estimate of the limit of detection was 150 nM. A preliminary evaluation of the selectivity of the structure was also performed by using Cd 2+ as possible interfering analytes.

Paper Details

Date Published: 3 March 2014
PDF: 9 pages
Opt. Eng. 53(7) 071816 doi: 10.1117/1.OE.53.7.071816
Published in: Optical Engineering Volume 53, Issue 7
Show Author Affiliations
Giancarlo Margheri, Istituto dei Sistemi Complessi (Italy)
Emilia Giorgetti, Istituto dei Sistemi Complessi (Italy)
Paolo Marsili, Istituto dei Sistemi Complessi (Italy)
Angela Zoppi, Istituto dei Sistemi Complessi (Italy)
Luisa Lascialfari, Univ. degli Studi di Firenze (Italy)
Stefano Cicchi, Univ. degli Studi di Firenze (Italy)


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