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Metasurface virtual absorbers: unveiling operative conditions through equivalent lumped circuit model
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  • Angelica Viola Marini ,
  • Davide Ramaccia ,
  • Alessandro Toscano ,
  • Filiberto Bilotti
Angelica Viola Marini
ROMA TRE University

Corresponding Author:[email protected]

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Davide Ramaccia
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Alessandro Toscano
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Filiberto Bilotti
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Virtual 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.
2021Published in EPJ Applied Metamaterials volume 8 on pages 3. 10.1051/epjam/2020014