@misc{10481/97893,
year = {2024},
month = {6},
url = {https://hdl.handle.net/10481/97893},
abstract = {This paper details a class of metal-based space-time metasurfaces for application in wireless com-
munications scenarios. Concretely, we describe space-time metasurfaces that periodically alternate their
properties in time between three spatial states: “air,” “conductor,” and “grating.” We analyze the physics of
these metastructures via a computationally efficient analytical technique based on the use of Floquet-Bloch
series, integral equations, and circuit models. By doing so, we reveal features of these spatiotemporal
metasurfaces: scattering parameters, field profiles, diffraction angles, and the nature of the space-time
harmonics. The results, corroborated with a self-implemented numerical finite-difference time-domain
approach, show the potential application of these space-time metasurfaces as beamformers acting in
reflection, in transmission or both. The amplitude and direction of the diffracted orders can be electroni-
cally controlled with the parameters of the metasurface. Moreover, the intrinsic ability of time-modulated
diffractive metasurfaces to mix and multiply frequencies is tested. We show how two different modulations
can lead to the same diffraction angle but with different mixed output frequencies.},
organization = {Grupo de investigación SWAT-TIC244},
organization = {MCIN/AEI/10.13039/501100011033 TED2021-129938B-I00, PID2020-112545RB-C54, PDC2022-133900-100, PDC2023-145862-I00, IJC2020-043599-I},
organization = {European Union NextGenerationEU/PRTR},
publisher = {American Physical Society},
keywords = {beam control},
keywords = {frequency conversion},
keywords = {optoelectronics},
keywords = {wave scattering},
keywords = {metagratings},
keywords = {metasurfaces},
keywords = {wireless communication networks},
keywords = {finite-difference time-domain method},
title = {Space-Time Metallic Metasurface for Frequency Conversion and Beamforming},
doi = {10.1103/PhysRevApplied.21.064018},
author = {Moreno Rodríguez, Salvador and Alex Amor, Antonio and Padilla De La Torre, Pablo and Valenzuela Valdés, Juan Francisco and Molero Jiménez, Carlos},
}