Marini_ArXiv.pdf (2.43 MB)
Metasurface virtual absorbers: unveiling operative conditions through equivalent lumped circuit model
preprint
posted on 2020-11-18, 15:14 authored by Angelica Viola MariniAngelica Viola Marini, Davide RamacciaDavide Ramaccia, Alessandro Toscano, Filiberto BilottiVirtual absorption concept
has been recently introduced as a new phenomenon observed in electromagnetics
and optics consisting of an undefined energy accumulation within a finite
volume of material without dissipation. The anomalous behaviour is achieved by engaging
the complex zero scattering eigenmodes of the virtual absorbing system by illuminating
it with a proper complex frequency, whose value is strictly determined by the system characteristics. In
this paper, we investigate on the position of the zero-pole scattering pairs in
the complex frequency plane as a function of the input impedance of the metasurface-based
lossless virtual absorber. We analytically derive the conditions under which a properly
modulated monochromatic plane wave can be virtually absorbed by the system and
stored within its volume. The analysis is developed by modelling the propagation
of a normally impinging plane wave though its equivalent transmission line
model terminated on an arbitrary reactive load, which in turn models the input
impedance of the metasurface-based system under consideration. The study allows
to determine a priori whether the metasurface-based system can support the
virtual absorption or not by evaluating the time-constant from its equivalent
circuit.
History
Email Address of Submitting Author
angelicaviola.marini@uniroma3.itSubmitting Author's Institution
ROMA TRE UniversitySubmitting Author's Country
- Italy