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Multifunctional flexible Au electrodes based on one-dimensional (1D) arrays of plasmonic gratings are nanofabricated over large areas with an engineered variant of laser interference lithography optimized for low-cost transparent templates. Au nanostripe (NS) arrays achieve sheet resistance in the order of 20 Ohm/square on large areas (~ cm2) and are characterized by a strong and dichroic plasmonic response which can be easily tuned across the visible (VIS) to near-infrared (NIR) spectral range by tailoring their cross-sectional morphology. Stacking vertically a second nanostripe, separated by a nanometer scale dielectric gap, we form near-field coupled Au/SiO2/Au dimers which feature hybridization of their localized plasmon resonances, strong local field-enhancements and a redshift of the resonance towards the NIR range. The possibility to combine excellent transport properties and optical transparency on the same plasmonic metasurface template is appealing in applications where low-energy photon management is mandatory like e.g., in plasmon enhanced spectroscopies or in photon harvesting for ultrathin photovoltaic devices. The remarkable lateral order of the plasmonic NS gratings provides an additional degree of freedom for tailoring the optical response of the multifunctional electrodes via the excitation of surface lattice resonances, a Fano-like coupling between the broad localised plasmonic resonances and the collective sharp Rayleigh modes.

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Publication history

Received: 28 February 2020
Revised: 11 September 2020
Accepted: 14 September 2020
Published: 01 March 2021
Issue date: March 2021

Copyright

© The Author(s) 2020

Acknowledgements

Financial support is gratefully acknowledged from Ministero dell’Università e della Ricerca Scientifica (MIUR) through the PRIN 2015 Grant 2015WTW7J3, from Compagnia di San Paolo in the framework of Project ID ROL 9361, and from MAECI in the framework of the Italy-Egypt bilateral protocol. One of the authors (D.C.) acknowledges ICTP, Trieste, Italy for the TRIL Fellowship.

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Email: nanores@tup.tsinghua.edu.cn

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