This work reports on the plasmonic properties of a Sn metasurface structure, in the wavelength region of 0.4–4 \(\mu \) m. On top of a glass substrate, the metasurface is formed by a central Sn nanobar surrounded with hexagonally oriented Sn nanobars. Multiple plasmonic resonances are observed, the plasmonic coupling effect at the Sn metasurface is revealed, and the corresponding electromagnetic field distributions are demonstrated. The results show that the electromagnetic field intensity near the surface of nanostructures can be enhanced by the near-field effect. The plasmonic resonance wavelength associated with the Sn nanobars can be tuned in the studied wavelength range, by adjusting the parameters of the metasurface. Based on this study, we suggest that the structure of the Sn metastructure proposed in this work be implemented in the design for plasmonic devices at 0.4–4 \(\mu \) m wavelengths.
