Hybrid plasmonic photonic structures combine the plasmonic response with the photonic band gap, holding promise for utilization as optical switches and sensors. Here, we demonstrate the active modulation of the optical response in such structures with two different external stimuli, e.g. laser pulses and bacteria. First, we report the fabrication of a miniaturized (5 x 5 mm) indium tin oxide (ITO) grating employing femtosecond laser micromachining, and we show the possibility to modulate the photonic band gap in the visible via ultrafast photoexcitation in the infrared part of the spectrum. Note that the demonstrated time response in the picosecond range of the spectral modulation have an industrial relevance. Moreover, we manufacture one-dimensional photonic crystals consisting of a solution-processed dielectric Bragg stack exposing a top-layer of bio-active silver. We assign the bacterial responsivity of the system to polarization charges at the Ag/bacterium interface, giving rise to an overall blue shift of the photonic band gap. © COPYRIGHT SPIE. Downloading of the abstract is permitted for personal use only.

Ultrafast photochromism and bacteriochromism in one dimensional hybrid plasmonic photonic structures

Francesco Scotognella;Giuseppe M. Paternò;Ilka Kriegel;Silvio Bonfadini;Liliana Moscardi;Maurizio Zani;Emilio Parisini;Guglielmo Lanzani
2020

Abstract

Hybrid plasmonic photonic structures combine the plasmonic response with the photonic band gap, holding promise for utilization as optical switches and sensors. Here, we demonstrate the active modulation of the optical response in such structures with two different external stimuli, e.g. laser pulses and bacteria. First, we report the fabrication of a miniaturized (5 x 5 mm) indium tin oxide (ITO) grating employing femtosecond laser micromachining, and we show the possibility to modulate the photonic band gap in the visible via ultrafast photoexcitation in the infrared part of the spectrum. Note that the demonstrated time response in the picosecond range of the spectral modulation have an industrial relevance. Moreover, we manufacture one-dimensional photonic crystals consisting of a solution-processed dielectric Bragg stack exposing a top-layer of bio-active silver. We assign the bacterial responsivity of the system to polarization charges at the Ag/bacterium interface, giving rise to an overall blue shift of the photonic band gap. © COPYRIGHT SPIE. Downloading of the abstract is permitted for personal use only.
FIBER LASERS AND GLASS PHOTONICS: MATERIALS THROUGH APPLICATIONS II: SPIE Photonics Europe 2020
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/11311/1166215
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