Terahertz plasmons in coupled two-dimensional semiconductor resonators

Sydoruk, O.; Wu, Jingbo; Mayorov, Alexander S.; Wood, C.; Mistry, D.; Cunningham, J. E.

doi:10.1103/physrevb.92.195304

Cited by 17 publications

(11 citation statements)

References 37 publications

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“…The reason lies in strong non-locality effects; in other words, the wave equation for two-dimensional plasmons represents an integral equation, not differential one. Consequently, not only plane waves are excited in confined structures, but also the evancesscent waves near the contacts 15,16 . From the first glance, the complexity of plasmonic response in confined 2DES makes full electromagnetic simulations 17,18 an only tool to predict their resonant properties.…”

Section: Introductionmentioning

confidence: 99%

Exact Solution for Driven Oscillations in Plasmonic Field-Effect Transistors

Svintsov

2018

Phys. Rev. Applied

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High-mobility field effect transistors can serve as resonant detectors of terahertz radiation due to excitation of plasmons in the channel. The modeling of these devices previously relied either on approximate techniques, or complex full-wave simulations. In this paper, we obtain an exact solution for driven electrical oscillations in plasmonic field-effect transistor with realistic contact geometry. The obtained solution highlights the importance of evanescent plasma waves excited near the contacts, which qualitatively modify the detector responsivity spectra. We derive the boundary condition on the ac floating electrodes of plasmonic FET which interpolates between open-circuit (Dyakonov-Shur) and short-circuit (clamped voltage) boundary conditions. In both limits, the FET photovoltage possesses resonant fringes, however, the absolute value of voltage is greater in the open-circuit regime.

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Section: Introductionmentioning

confidence: 99%

Exact Solution for Driven Oscillations in Plasmonic Field-Effect Transistors

Svintsov

2018

Phys. Rev. Applied

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“…Initially observed in 2D systems of electrons on a liquid helium surface 3 as well as in silicon inversion layers [4][5][6] , 2D plasmons continue to be actively investigated in various 2D structures [7][8][9][10][11][12][13][14][15][16][17][18][19][20][21] . It should also be mentioned that 2D plasmons, especially in structures with metal gates, have proven promising as detectors and emitters of radiation in the terahertz range [22][23][24][25][26][27][28][29][30][31] .…”

Section: Introductionmentioning

confidence: 99%

Plasmons and magnetoplasmons in partially bounded two-layer electron systems

Zabolotnykh,

Volkov

2020

Preprint

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We have analytically studied plasmons in an electron system comprised of two spatially separated layers -an infinite two-dimensional electron system (2DES) and a 2D strip. Our analysis reveals the existence of plasmon modes that are localized near and propagate along the strip. These modes are characterized by the wave vector in the direction of the strip, as well as the number of charge density nodes, N , across the strip. In the long-wavelength limit, the fundamental mode N = 0 is found to have gapless linear dispersion. When the external perpendicular magnetic field is applied, this mode remains gapless and exhibits peculiar magnetodispersion. We analyze the correlation between our findings and the previously established results on plasmons in gated and partially gated 2DESs.

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“…1, for example, contains three such interacting resonators formed by the gated section and the two ungated sections of the 2DES. As a result of this interaction, the system may support a spectrum of hybridized eigenmodes that cannot be reduced to either purely gated or purely ungated resonances [22].…”

Section: Introductionmentioning

confidence: 99%

“…The resulting integral equation is then solved numerically. Another approach, used to study plasmon reflection and transmission at waveguide junctions, is modal analysis, in which the electromagnetic fields at both sides of a junction are expanded into the waveguide eigenmodes [5,16,22,[31][32][33][34]. Another example is the Wiener-Hopf technique [35,36], which has been used recently to derive expressions for plasmon transmission and reflection at a junction between two ungated 2DESs [37].…”

Section: Introductionmentioning

confidence: 99%

Terahertz Plasmon Resonances in Two-Dimensional Electron Systems: Modeling Approaches

et al. 2019

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Known approaches to modeling terahertz plasmons in two-dimensional electron systems may differ significantly in their assumptions. There has, however, been little effort to analyze the differences between and application of different models to the same sets of structures. This paper discusses, develops, and compares several different theoretical approaches-namely, an effective-medium approximation, a transmission-line model, modal analysis, and full-wave simulations. In particular, we present a transmission-line model that takes into account the dielectric-air surrounding a two-dimensional system. Using modal analysis, we also solve analytically the problem of plasmon reflection and transmission when plasmons are incident on a junction between gated and ungated two-dimensional waveguides. Comparing the predictions made by the models for several structures, we find good agreement between full-wave simulations and both analytical and numerical modal analysis. The results of the effective-medium approximation and the transmissionline model also agree with each other, but differ quantitatively from those of the full-wave simulations and modal analysis. We attribute the differences to the phases of the plasmon reflection and transmission coefficients obtained with the different approaches. Our analytical expressions for the plasmon transmission and reflection coefficients represent a simple, yet accurate way to model plasmons in two-dimensional systems comprising both gated and ungated sections.

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Terahertz plasmons in coupled two-dimensional semiconductor resonators

Cited by 17 publications

References 37 publications

Exact Solution for Driven Oscillations in Plasmonic Field-Effect Transistors

Exact Solution for Driven Oscillations in Plasmonic Field-Effect Transistors

Plasmons and magnetoplasmons in partially bounded two-layer electron systems

Terahertz Plasmon Resonances in Two-Dimensional Electron Systems: Modeling Approaches

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