Scattering-induced amplification of two-dimensional plasmons: Electromagnetic modeling

Zonetti, Simone; Siaber, S.; Cunningham, J. E.; Sydoruk, O.

doi:10.1063/5.0050053

Cited by 4 publications

(2 citation statements)

References 56 publications

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“…Reflection and scattering of the SIPP by abrupt change of the dielectric constant of the medium above metal [20], or by the end face of the metal slab [21] have been also studied. More recent studies concern the scattering phenomena in two-dimensional (2D) material systems [22,23] and specifically in graphene [24][25][26][27][28][29][30]. It should be emphasized that all the recent works mentioned above, deal with the asymmetric SRSPP mode of a plasma layer embedded in dielectric environment.…”

Section: Introductionmentioning

confidence: 99%

Reflection and scattering of long-range surface plasmon-polaritons on boundary of free half-space

Morozov

2024

Phys. Scr.

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We study the long-range surface plasmon-polariton (LRSPP) propagating along a thin metal ﬁlm embedded in a homogeneous semi-inﬁnite medium. The reﬂection and scattering of the LRSPP by the end face of the ﬁlm at the boundary of free half-space are discussed. We apply the self-consistent electromagnetic approach using the expansion of the plasmon and scattered ﬁelds by the eigenfunctions of the structure. The Fredholm integral equation of the ﬁrst kind appearing in the model has been solved with using the variational Ritz-Galerkin procedure.It is shown that the LRSPP reﬂection coeﬃcient can be approximated by the Fresnel formula of reﬂection for normal incidence of a plane TEM wave. The power of the back-scattered radiation is predicted to be a considerable part (tens of percents) of the reﬂected LRSPP power. We discuss the far-ﬁeld patterns of both the backand forward-scattered radiation. It is shown that the back-scattered radiation form two narrow lobes directed symmetrically with regard to the metal ﬁlm plane. The radiation scattered in the forward direction is presented by the one-lobe far-ﬁeld pattern; decreasing the metal layer thickness results in the narrower lobe of the forward-scattered radiation.

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Section: Introductionmentioning

confidence: 99%

Reflection and scattering of long-range surface plasmon-polaritons on boundary of free half-space

Morozov

2024

Phys. Scr.

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“…Recent studies on electrically-driven * Author to whom any correspondence should be addressed. plasmon sources have concentrated on, for example, emission by Dirac electrons [11], instability at high electric fields [12], channels of variable width [13], and electromagnetic modelling [14].…”

Section: Introductionmentioning

confidence: 99%

Effect of mesa geometry on low-terahertz frequency range plasmons in two-dimensional electron systems

Dawood¹,

Park²,

Parker-Jervis³

et al. 2021

J. Phys. D: Appl. Phys.

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We demonstrate engineering of the low-terahertz range plasmonic spectra of two-dimensional electron systems by modifying their geometry. Specifically, we have modelled, fabricated, and measured two devices for comparison. The first device has a rectangular channel, while the second is trapezoidal, designed to support a richer plasmonic spectrum by causing variation in the device width along the direction of plasmon propagation. We show that while plasmon resonant frequencies and field distributions in the rectangular device can largely be described by a simple onedimensional analytical model, the field distributions modelled in the trapezoidal device shows a more complex pattern with significant variation along the length of the channel, so requiring a two-dimensional treatment. The results illustrate the potential of modifying the channel geometry to obtain different spectra in experiments, with potential applications in the design of novel terahertz-range devices, such as plasmonbased sources and detectors.

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Negative damping of terahertz plasmons in counter-streaming double-layer two-dimensional electron gases

Yang,

Guo,

Zhang

et al. 2024

J. Phys. D: Appl. Phys.

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The plasmon excitation in two-dimensional electron gases is a significant way of achieving micro-nanoscale terahertz (THz) devices. Here, we establish a kinetic simulation model to study the THz plasmons amplification in a semiconductor double-quantum-well system with counter-streaming electron drift velocities. By comparing the simulation results with theoretical dispersion relations, we confirm two competing mechanisms of negative damping suitable for THz amplification: Cherenkov-type two-stream instability and a new non-Cherenkov mechanism called kinetic relaxation instability. The former is caused by the interlayer coupling of two slow plasmon modes and only exists when the drift velocities are much greater than the fermi velocities. The latter is a statistical effect caused by the momentum relaxation of electron-impurity scattering and predominates at lower drift velocities. We show that an approximate kinetic dispersion relation can accurately predict the wave growth rates of the two mechanisms. The results also indicate that the saturated plasmonic waves undergo strong nonlinearities such as wave distortion, frequency downshift, wave-packet formation, and spectrum broadening. The nonlinear evolution can be interpreted as the merging of bubble structures in the electron phase-space distribution. The present results not only reveal the potential mechanisms of the plasmonic instabilities in double-layer 2DEGs, but also provide a new guideline for the design of on-chip THz amplifiers.

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Scattering-induced amplification of two-dimensional plasmons: Electromagnetic modeling

Cited by 4 publications

References 56 publications

Reflection and scattering of long-range surface plasmon-polaritons on boundary of free half-space

Reflection and scattering of long-range surface plasmon-polaritons on boundary of free half-space

Effect of mesa geometry on low-terahertz frequency range plasmons in two-dimensional electron systems

Negative damping of terahertz plasmons in counter-streaming double-layer two-dimensional electron gases

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