We report on the design, fabrication, and characterization of optical sensors based on Bloch surface waves propagating at the truncation edge of one-​dimensional photonic crystals. The sensors can be simultaneously operated in both a label-​free mode, where small refractive index changes at the surface are detected, and a fluorescence mode, where the fluorescence from a novel heptamethyne dye label in the proximity of the surface is collected. The two modes operate in the near-​IR spectral range with the same configuration of the optical reading app. The limit of detection is shown to be smaller than that of equiv. surface plasmon sensors and the fluorescence collection efficiency is such that it can be efficiently analyzed by the same camera sensor used for label-​free operation.

Combining label-free and fluorescence operation of Bloch surface wave optical sensors

MAGISTRIS, CLAUDIO;BAROLO, CLAUDIA;
2014-01-01

Abstract

We report on the design, fabrication, and characterization of optical sensors based on Bloch surface waves propagating at the truncation edge of one-​dimensional photonic crystals. The sensors can be simultaneously operated in both a label-​free mode, where small refractive index changes at the surface are detected, and a fluorescence mode, where the fluorescence from a novel heptamethyne dye label in the proximity of the surface is collected. The two modes operate in the near-​IR spectral range with the same configuration of the optical reading app. The limit of detection is shown to be smaller than that of equiv. surface plasmon sensors and the fluorescence collection efficiency is such that it can be efficiently analyzed by the same camera sensor used for label-​free operation.
2014
39
10
2947
2950
NIR dyes Fluorescence Near-IR spectra Optical sensors Photonic crystals
A. Sinibaldi; A. Fieramosca; R. Rizzo; O. Anopchenko; N. Danz; P. Munzert; C. Magistris; C. Barolo; F. Michelotti
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/2318/151984
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