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Ultra-broadband simultaneous superluminal phase and group velocities in non-Foster epsilon-near-zero metamaterial
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10.1063/1.4790297
/content/aip/journal/apl/102/5/10.1063/1.4790297
http://aip.metastore.ingenta.com/content/aip/journal/apl/102/5/10.1063/1.4790297
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Figures

Image of FIG. 1.
FIG. 1.

An example of narrowband superluminal propagation in typical system with anomalous dispersion (Lorentz dispersion model 14 with normalized central frequency ω 0 = 1 and a half-power bandwidth Δω = 0.1). (a) Real (solid-blue) and imaginary (dashed-red) part of a complex index of refraction. (b) The phase velocity (solid-blue) and the group velocity (dashed-red). (c) Typical transmission-line-based ENZ metamaterial implementation. Here, series distributed inductance L 1 assures dispersionless effective permeability, while the lossy double-resonant circuit (L 2, R, L, CΔx) assures Lorentzian permittivity behavior with a narrowband region with anomalous dispersion.

Image of FIG. 2.
FIG. 2.

(a) The properties of fictitious lossless broadband system with simultaneous superluminal phase and group velocities. The index of refraction (solid-blue) and the phase and group velocities (dashed-red). (b) The implementation based on active transmission-line non-Foster ENZ metamaterial. 17

Image of FIG. 3.
FIG. 3.

Measurements in frequency-domain, (a) experimental set-up, (b) extracted effective permittivity (real part: solid-blue, imaginary part: dashed-red), (c) extracted index of refraction (real part-solid-blue, imaginary part: dashed-red, the lossless approximation: dotted-black), (d) extracted phase velocity (dashed-red) and the group velocity (solid-blue).

Image of FIG. 4.
FIG. 4.

Measurements in time-domain, (a) experimental set-up, (b) time-domain waveforms (input signal: dashed-black, output signal with ENZ off: dashed-blue, output signal with ENZ on: solid-red), (c) FFT spectra (input signal: dashed-black, output signal with ENZ off: dotted-blue, output signal with ENZ on: solid-red).

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/content/aip/journal/apl/102/5/10.1063/1.4790297
2013-02-07
2014-04-17
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Ultra-broadband simultaneous superluminal phase and group velocities in non-Foster epsilon-near-zero metamaterial
http://aip.metastore.ingenta.com/content/aip/journal/apl/102/5/10.1063/1.4790297
10.1063/1.4790297
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