Transmission lines emulating moving media

Vehmas, Joni; Hrabar, Silvio; Tretyakov, Sergei A.

doi:10.1109/ursigass.2014.6929221

Cited by 3 publications

(5 citation statements)

References 11 publications

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“…The link between moving media and bianisotropic effective parameters has been shown in the past [25,26]. Hence, since the space-time modulated medium can be represented by effective bianisotropic parameters, it can also be linked to an equivalent moving medium.…”

Section: Equivalent Moving Mediummentioning

confidence: 98%

“…By mapping the tensors (24)(25)(26) to the set of effective bianisotropic parameters in Eqs. (19)(20)(21)(22), we determine,…”

Section: Equivalent Moving Mediummentioning

confidence: 99%

“…Importantly, relativity imposes that the permittivity and permeability of a moving medium change at the same pace, see (24)(25)(26), as electric and magnetic effects are intimately linked to each other in relativity. Hence, the mapping to a moving medium can be done only in the case of space-time modulations of both and µ, whereas the moving medium interpretation is not exact if either material parameter is not modulated.…”

Section: Equivalent Moving Mediummentioning

confidence: 99%

See 2 more Smart Citations

Fresnel drag in space–time-modulated metamaterials

Huidobro

Galiffi

Guenneau

et al. 2019

Proc. Natl. Acad. Sci. U.S.A.

158

110

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A moving medium drags light along with it as measured by Fizeau and explained by Einstein's theory of special relativity. Here we show that the same effect can be obtained in a situation where there is no physical motion of the medium. Modulations of both the permittivity and permeability, phased in space and time in the form of travelling waves, are the basis of our model. Space-time metamaterials are represented by effective bianisotropic parameters, which can in turn be mapped to a moving homogeneous medium. Hence these metamaterials mimic a relativistic effect without the need for any actual material motion. We discuss how both the permittivity and permeability need to be modulated in order to achieve these effects, and we present an equivalent transmission line model.

show abstract

Section: Equivalent Moving Mediummentioning

confidence: 98%

“…By mapping the tensors (24)(25)(26) to the set of effective bianisotropic parameters in Eqs. (19)(20)(21)(22), we determine,…”

Section: Equivalent Moving Mediummentioning

confidence: 99%

Section: Equivalent Moving Mediummentioning

confidence: 99%

See 1 more Smart Citation

Fresnel drag in space–time-modulated metamaterials

Huidobro

Galiffi

Guenneau

et al. 2019

Proc. Natl. Acad. Sci. U.S.A.

158

110

View full text Add to dashboard Cite

show abstract

“…Here, we are interested in a material response of the form: zz . We refer to this type response (with  real-valued and possibly frequency dependent) as a moving-medium type coupling [32,49]. We note in passing that for moving media the constitutive parameters are required be evaluated at the Doppler shifted frequency [50,51].…”

Section: Relation With Moving-type Mediamentioning

confidence: 99%

P·T·Dsymmetry-protected scattering anomaly in optics

Silveirinha

2017

Phys. Rev. B

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In time-reversal invariant electronic systems the scattering matrix is anti-symmetric. This property enables an effect, designated here as "scattering anomaly", such that the electron transport does not suffer from back reflections, independent of the specific geometry of the propagation path or the presence of time-reversal invariant defects. In contrast, for a generic time-reversal invariant photonic system the scattering matrix is symmetric and there is no similar anomaly. Here, it is theoretically proven that despite these fundamental differences there is a wide class of photonic platforms -in some cases formed only by

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“…The basic idea is an additional cross-coupling between series and shunt braches of the transmission line via transformer [17] (or, equivalently, the cross-coupling between orthogonal components of electric and magnetic field vectors of a plane wave). This principle was further extended in [83] using active coupling (via gyrator) enabling moving-media behavior. The same idea may be applied for both gain-based and non-Foster-based active metamaterials.…”

Section: Adding Bianisotropic (Reciprocal or Non-reciprocal) Behaviormentioning

confidence: 99%

First ten years of active metamaterial structures with “negative” elements

Hrabar

2018

EPJ Appl. Metamat.

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Almost ten years have passed since the first experimental attempts of enhancing functionality of radiofrequency metamaterials by embedding active circuits that mimic behavior of hypothetical negative capacitors, negative inductors and negative resistors. While negative capacitors and negative inductors can compensate for dispersive behavior of ordinary passive metamaterials and provide wide operational bandwidth, negative resistors can compensate for inherent losses. Here, the evolution of aforementioned research field, together with the most important theoretical and experimental results is reviewed. In addition, some very recent efforts that go beyond idealistic impedance negation and make use of inherent non-ideality, instability, and non-linearity of realistic devices, are highlighted. Finally, a very fundamental, but still unsolved issue of common theoretical framework that connects causality, stability, and non-linearity of networks with negative elements is stressed.

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Transmission lines emulating moving media

Cited by 3 publications

References 11 publications

Fresnel drag in space–time-modulated metamaterials

Fresnel drag in space–time-modulated metamaterials

P·T·Dsymmetry-protected scattering anomaly in optics

First ten years of active metamaterial structures with “negative” elements

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