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The engineering of self-organized plasmonic metasurfaces is demonstrated using a maskless technique with defocused ion-beam sputtering and kinetically controlled deposition. The proposed reliable, cost-effective, and controllable approach enables large-area (order of square centimeter) sub-wavelength periodic patterning with close-packed gold nanostrips. A multi-level variant of the method leads to high-resolution manufacturing of vertically stacked nanostrip dimer arrays, without resorting to lithographic approaches. The design of these self-organized metasurfaces is optimized by employing plasmon hybridization methods. In particular, preliminary results on the so-called gap-plasmon configuration of the nanostrip dimers, implementing magnetic dipole resonance in the near-infrared range, are reported. This resonance offers a superior sensitivity and field enhancement, compared with the more conventional electric dipole resonance. The translational invariance of the nanostrip configuration leads to a high filling factor of the hot spots. These advanced features make the large-area metasurface based on gap-plasmon nanostrip dimers very attractive for surface-enhanced linear and nonlinear spectroscopy (e.g., surface-enhanced Raman scattering) and plasmon-enhanced photon harvesting in solar and photovoltaic cells.

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Publication history

Received: 06 July 2017
Revised: 13 December 2017
Accepted: 28 December 2017
Published: 02 August 2018
Issue date: July 2018

Copyright

© Tsinghua University Press and Springer-Verlag GmbH Germany, part of Springer Nature 2018

Acknowledgements

Acknowledgements

We gratefully acknowledge the financial support by the Ministero dell'Istruzione, dell'Università e della Ricerca (MIUR) through the PRIN 2015 Grant No. 015WTW7J3. F. Buatier de Mongeot acknowledges the support by the Compagnia di San Paolo through the Project ID ROL 9361 and by the MAECI through the Italy-Egypt bilateral protocol. F. Buatier de Mongeot and G. Della Valle acknowledge the COST Action MP1302-NanoSpectroscopy.

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Email: nanores@tup.tsinghua.edu.cn

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