Metal-clad optical waveguide fluorescence device for the detection of heavy metal ions

Giancarlo Margheri; Emilia Giorgetti; Paolo Marsili; Angela Zoppi; Luisa Lascialfari; Stefano Cicchi

doi:10.1117/1.OE.53.7.071816

3 March 2014 Metal-clad optical waveguide fluorescence device for the detection of heavy metal ions

Giancarlo Margheri, Emilia Giorgetti, Paolo Marsili, Angela Zoppi, Luisa Lascialfari, Stefano Cicchi

Author Affiliations +

Optical Engineering, Vol. 53, Issue 7, 071816 (March 2014). https://doi.org/10.1117/1.OE.53.7.071816

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.

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Giancarlo Margheri, Emilia Giorgetti, Paolo Marsili, Angela Zoppi, Luisa Lascialfari, and Stefano Cicchi "Metal-clad optical waveguide fluorescence device for the detection of heavy metal ions," Optical Engineering 53(7), 071816 (3 March 2014). https://doi.org/10.1117/1.OE.53.7.071816

Published: 3 March 2014

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