Nanofabrication Process Scale-Up via Displacement Talbot Lithography of a Plasmonic Metasurface for Sensing Applications

The selection of an affordable method to fabricate plasmonic metasurfaces needs to guarantee complex control over both tunability and reproducibility of their spectral and morphological properties, making plasmonic metasurfaces suitable for integration into different sensing devices. Displacement Ta...

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Bibliographic Details
Published in:Optics 2024-03, Vol.5 (1), p.165-175
Main Authors: Pellacani, Paola, Jefimovs, Konstantins, Angelini, Margherita, Marabelli, Franco, Tolardo, Valentina, Kazazis, Dimitrios, Floris, Francesco
Format: Article
Language:English
Subjects:
Glass substrates
Gold
lithographic techniques
Manufacturing
optical (bio)sensing
Plasma
plasmonic metasurface
Symmetry
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Summary:The selection of an affordable method to fabricate plasmonic metasurfaces needs to guarantee complex control over both tunability and reproducibility of their spectral and morphological properties, making plasmonic metasurfaces suitable for integration into different sensing devices. Displacement Talbot lithography could be a valid solution thanks to the limited fabrication steps required, also providing the highly desired industrial scalability. Fabricated plasmonic metasurfaces are represented by a gold nanohole array on a glass substrate based on a triangular pattern. Scanning electron microscopy measurements have been recorded, showing the consistency of the surface features with the optimized design parameters. Reflectance and transmittance measurements have also been carried out to test the reliability and standardization of the metasurface’s optical response. Furthermore, these plasmonic metasurfaces have also been successfully tested for probing refractive index variations in a microfluidic system, paving the way for their use in sensitive, real-time, label-free, and multiplexing detection of bio-molecular events.
ISSN:2673-3269
2673-3269
DOI:10.3390/opt5010012