@misc{10481/82826,
year = {2023},
month = {4},
url = {https://hdl.handle.net/10481/82826},
abstract = {This paper presents an analytical framework for the analysis of time-varying metal-based metamaterials.
Specifically, we particularize the study to time-modulated metal-air interfaces embedded between two
different semi-infinite media that are illuminated by monochromatic plane waves of frequency ω0. The
formulation is based on a Floquet-Bloch modal expansion, which takes into account the time periodicity
of the structure (Ts = 2π/ωs) and integral-equation techniques. It allows us to extract the reflection and
transmission coefficients as well as to derive nontrivial features about the dynamic response and dispersion
curves of time-modulated metal-based screens. In addition, the proposed formulation has an associated
analytical equivalent circuit that gives a physical insight into the diffraction phenomenon. Similarities
and differences between space- and time-modulated metamaterials are discussed via the proposed circuit
model. Finally, some analytical results are presented to validate the present framework. Good agreement
is observed with numerical computations provided by a self-implemented finite-difference time-domain
(FDTD) method. Interestingly, the present results suggest that time-modulated metal-based screens can be
used as pulsed sources (when ωs   ω0), beam formers (ωs ∼ ω0) to redirect energy in specific regions of
space, and analog samplers (ωs   ω0).},
organization = {Spanish Government	ID2020-112545RB-C54
RTI2018-102002-A-I00},
organization = {Junta de Andalucia	B-TIC-402-UGR18
A-TIC-608- UGR20
PYC20-RE-012-UGR
P18.RT.4830},
organization = {Leonardo Grant of the BBVA Foundation},
organization = {BBVA Foundation},
publisher = {American Physical Society},
title = {Diffraction Phenomena in Time-Varying Metal-Based Metasurfaces},
doi = {10.1103/PhysRevApplied.19.044014},
author = {Alex Amor, Antonio and Moreno Rodríguez, Salvador and Padilla De La Torre, Pablo and Valenzuela Valdes, Juan Francisco},
}