Absorption and Scattering by a Temporally Switched Lossy Layer: Going beyond the Rozanov Bound

Firestein, Chen; Shlivinski, Amir; Hadad, Yakir

doi:10.1103/physrevapplied.17.014017

Cited by 24 publications

(4 citation statements)

References 44 publications

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“…3(b),(c)). Along similar lines, a recent work theoretically demonstrated, through Green's function analysis and numerical optimizations, that a suitable switching of both the conductivity and permittivity leads to a reduction of reflection over the whole frequency spectrum [92]. As an alternative strategy, a recent experimental work [93] also demonstrated broadband absorption by creating an energy-trap through switched electronic components triggered by the pulse entering the absorbing region.…”

Section: Electromagnetic Absorptionmentioning

confidence: 90%

Using Time-Varying Systems to Challenge Fundamental Limitations in Electromagnetics

Hayran¹,

Monticone²

2022

Preprint

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Time-varying components provide an exceptional opportunity to explore novel means for building efficient electromagnetic devices. While such explorations date back to more than half a century ago, recent years have experienced a renewed and increased interest into the design of dynamic electromagnetic systems. This resurgence has been partly fueled by the desire to surpass the performance of conventional devices, and to enable systems that can challenge various well-established physical bounds, such as the Bode-Fano limit, the Chu limit, etc. Here, we overview this emerging research area and provide a concise and systematic summary of the most relevant applications for which the relevant physical bounds can be overcome through time-varying elements. Besides leading to devices with superior performances, such research endeavors open new possibilities and might offer insight towards future all-electromagnetic/optical technologies.

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Section: Electromagnetic Absorptionmentioning

confidence: 90%

Using Time-Varying Systems to Challenge Fundamental Limitations in Electromagnetics

Hayran¹,

Monticone²

2022

Preprint

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“…In this process we may observe that the integration around the closed contour B ∪ C ∞ − can be obtained by summing the residues. As this sum can be further related to (the opposite of) the residue at infinity, we readily get s Γ1 (s) |s|→∞ = γ ∞ 1 , i.e., the coefficient that occurs on the right-hand side of (9). Since the integration along C ∞ − gives γ ∞ 1 /2, Eq.…”

Section: A Cauchy Contour Integral Approachmentioning

confidence: 94%

Time-Domain Physical Limitations on the Response of a Class of Time-Invariant Systems

Stumpf,

Nordebo

2024

Preprint

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We propose time-domain (TD) physical limitations on the system function of a linear, time-invariant system. Two approaches to derive TD physical bounds are presented. The first approach is based on Cauchy's integral of the Laplace transform of a causal transfer function, while the second one relies on an integral representation of positive real (PR) functions. The analysis yields straightforward bounds on the output signal that can be readily used to benchmark the performance of time-varying electromagnetic (EM) structures. The results are illustrated on selected transmission-line problems and on the pulsed EM plane wave scattering by thin high-contrast sheets.

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“…Under linearity and time invariance (LTI) assumptions Rozanov has established analytically a sum-rule trade-off between the absorption efficiency over a predefined bandwidth and the thickness of the layer, that is the so called Rozanov bound. In recent years several proposals have been introduced to bypass this bound by using non-LTI absorbers [1][2]. However, in practice, their implementation may be challenging due to the need to encapsulate together the wave system and the modulation network.…”

mentioning

confidence: 99%

Absorption beyond Rozanov bound by LTI surfaces

Firestein,

Shlivinski,

Hadad

2023

Proceedings of the XXXVth URSI General Assembly and Scientific Symposium – GASS 2023

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Absorption and Scattering by a Temporally Switched Lossy Layer: Going beyond the Rozanov Bound

Cited by 24 publications

References 44 publications

Using Time-Varying Systems to Challenge Fundamental Limitations in Electromagnetics

Using Time-Varying Systems to Challenge Fundamental Limitations in Electromagnetics

Time-Domain Physical Limitations on the Response of a Class of Time-Invariant Systems

Absorption beyond Rozanov bound by LTI surfaces

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