Nonscattering Metasurface-Bound Cavities for Field Localization, Enhancement, and Suppression

Cuesta, F. S.; Asadchy, Viktar; Sayanskiy, Andrey; Lenets, Vladimir; Mirmoosa, M. S.; Ma, Xin; Glybovski, Stanislav; Tretyakov, Sergei

doi:10.1109/tap.2019.2938661

Cited by 12 publications

(11 citation statements)

References 48 publications

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“…The localization and confinement of electromagnetic energy in a finite volume without dissipation has been extensively studied by the scientific community in the last years, by exploiting the anomalous interaction between light and artificial metastructures [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19]. In this framework, virtual absorption concept [20][21][22][23][24] represents one of the most appealing technique for storing and releasing electromagnetic energy, due to passive and simple structures that can support the desired energy accumulation.…”

Section: Introductionmentioning

confidence: 99%

Metasurface virtual absorbers: unveiling operative conditions through equivalent lumped circuit model

et al. 2021

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Virtual absorption concept has been recently introduced as a new phenomenon observed in electromagnetics and optics consisting of theoretically unlimited accumulation of energy 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 ω = ω r + jω i , 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 through its equivalent transmission line model terminated in 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.

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Section: Introductionmentioning

confidence: 99%

Metasurface virtual absorbers: unveiling operative conditions through equivalent lumped circuit model

et al. 2021

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“…Planar structures with periodically arranged subwavelength elements, coined as metasurfaces [1][2][3][4][5], have attracted considerable attention in the last decade (see e.g. [6][7][8][9][10][11][12][13][14][15]). One important application of such artificial surfaces is in controlling surface waves [16][17][18][19], including a single metasurface [1] or a metasurface over a grounded slab [20,21].…”

Section: Introductionmentioning

confidence: 99%

“…Analogous to these planar waveguides, new designs for open waveguide structures can be introduced, which are formed by two parallel and penetrable metasurfaces separated by a finite distance [26]. Such open waveguides confine the electromagnetic energy while the corresponding fields are attenuated away from the structure (note that these guiding structures can be intriguingly invisible under plane-wave illumination [13]). An interesting special case of those waveguides is the set of two penetrable metasurfaces which are Babinet-complementary.…”

Section: Introductionmentioning

confidence: 99%

Complementary Metasurfaces for Guiding Electromagnetic Wave

Mirmoosa

Tretyakov

2021

IEEE Trans. Antennas Propagat.

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Waveguides are critically important components in microwave, THz, and optical technologies. Due to recent progress in two-dimensional materials, metasurfaces can be efficiently used to design novel waveguide structures which confine the electromagnetic energy while the structure is open. Here, we introduce a special type of such structures formed by two penetrable metasurfaces which have complementary isotropic surface impedances. We theoretically study guided modes supported by the proposed structure and discuss the corresponding dispersion properties. Furthermore, we show the results for different scenarios in which the surface impedances possess non-resonant or resonant characteristics, and the distance between the metasurfaces changes from large values to the extreme limit of zero. As an implication of this work, we demonstrate that there is a possibility to excite two modes with orthogonal polarizations having the same phase velocity within a broad frequency range. This property is promising for applications in leaky-wave antennas and field focusing.

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Section: Introductionmentioning

confidence: 99%

Metasurface virtual absorbers: unveiling operative conditions through equivalent lumped circuit model

Marini¹,

Ramaccia²,

Toscano³

et al. 2020

Preprint

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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.

show abstract

Nonscattering Metasurface-Bound Cavities for Field Localization, Enhancement, and Suppression

Cited by 12 publications

References 48 publications

Metasurface virtual absorbers: unveiling operative conditions through equivalent lumped circuit model

Metasurface virtual absorbers: unveiling operative conditions through equivalent lumped circuit model

Complementary Metasurfaces for Guiding Electromagnetic Wave

Metasurface virtual absorbers: unveiling operative conditions through equivalent lumped circuit model

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