Patterned silver island paths as high-contrast optical sensing platforms

•Photoresist-based fabrication of silver island stripes.•Demonstration of plasmonic coupling between SIPs and photoactive proteins.•Observation of improved optical contrast by incorporating monolayer graphene. Well-defined paths assembled of silver islands were fabricated by combining photolithograp...

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Published in:Materials science & engineering. B, Solid-state materials for advanced technology Solid-state materials for advanced technology, 2021-06, Vol.268, p.115124, Article 115124
Main Authors: Sulowska, Karolina, Roźniecka, Ewa, Wiwatowski, Kamil, Janczuk-Richter, Marta, Jönsson-Niedziółka, Martin, Niedziółka-Jönsson, Joanna, Mackowski, Sebastian
Format: Article
Language:English
Subjects:
Chemical synthesis
Coupling
Energy transfer
Fluorescence
Fluorescence enhancement
Fluorescence spectroscopy
Graphene
Islands
Optical imaging
Photolithography
Plasmonics
Protein sensing
Proteins
Resonance
Substrates
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Summary:•Photoresist-based fabrication of silver island stripes.•Demonstration of plasmonic coupling between SIPs and photoactive proteins.•Observation of improved optical contrast by incorporating monolayer graphene. Well-defined paths assembled of silver islands were fabricated by combining photolithography with wet-chemical synthesis. The islands feature lateral sizes of the order of 100 nm, and similar heights, thus promoting localized plasmon resonance. Wavelength-dependent fluorescence imaging as well as time-resolved fluorescence of photoactive proteins deposited on such a substrate confirms enhancement of the fluorescence due to coupling with the plasmon resonance. The coupling leads to strong contrast in the optical response, which enables direct imaging of photoactive protein emission. Importantly, the contrast can be further improved by covering the silver island paths with graphene and taking advantage of a very efficient energy transfer.
ISSN:0921-5107
1873-4944
DOI:10.1016/j.mseb.2021.115124