Abstract
Here, we show that a hybrid plasmonic/photonic crystal consisting of a thin layer of bioactive plasmonic material (i.e. silver) deposited on top a 1D PhC can detect one of the most common bacterial contaminant, namely Escherichia coli. We speculate that the change in the plasmon charge density brought about by metal/bacterium interaction results in a variation of the plasmon resonance that, in turns, translates in a shift of the photonic structural color.
Highlights
Photonic crystals (PhCs) have been largely employed as detection/sensing devices in recent years, since the photonic stop-band can be tuned by applying a number of external stimuli, such as chemical[1], thermal[2] and mechanical triggers[3]
We show that a hybrid plasmonic/photonic crystal consisting of a thin layer of bioactive plasmonic material deposited on top a 1D PhC can detect one of the most common bacterial contaminant, namely Escherichia coli
The plasmonic metal can be seen as defective layer of the photonic crystal that affects the optical response of the PhC via its free carrier density.> the main goal is to modify the dielectric properties at the PhC/metal interface and, the overall optical read-out by exploiting the possible change in the silver complex dielectric function caused by Ag/bacteria interaction
Summary
Photonic crystals (PhCs) have been largely employed as detection/sensing devices in recent years, since the photonic stop-band can be tuned by applying a number of external stimuli, such as chemical[1], thermal[2] and mechanical triggers[3]. We show that a hybrid plasmonic/photonic crystal consisting of a thin layer of bioactive plasmonic material (i.e. silver) deposited on top a 1D PhC can detect one of the most common bacterial contaminant, namely Escherichia coli.
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