Plasma wave oscillations in a nonequilibrium two-dimensional electron gas: Electric field induced plasmon instability in the terahertz frequency range

Korotyeyev, V. V.; Kochelap, V. A.

doi:10.1103/physrevb.101.235420

Cited by 8 publications

(4 citation statements)

References 61 publications

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“…Although many aspects of grating-gate PCs have been examined theoretically by research groups led by Mikhailov [20], Popov [21,22] and Kochelap [23][24][25][26], a comprehensive exploration of the characteristics of these structures remains notably absent in the scientific literature. This knowledge gap can be attributed to two primary challenges.…”

Section: Introductionmentioning

confidence: 99%

THz properties of grating-gate plasmonic crystals

Sai,

Dub,

Korotyeyev

et al. 2023

physics

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This study reviews recent advances in the modern field of terahertz plasmonics concerning the control of resonant properties of grating-gate plasmonic crystal structures. Particularly, we conducted both experimental and theoretical investigations of AlGaN/GaN grating-gate structures with a focus on investigations of the resonant structure of transmission spectra associated with plasmon excitations in two-dimensional electron gas at different modulation degree of concentration profiles. Two distinct resonant phases of the plasmonic crystal structure were analyzed. The first one, the delocalized phase, is observed in the case of a small modulation degree of electron gas. In this phase, we found that plasmonic resonant absorption of incident radiation occurs across the entire grating-gate structure, with domination in the gated regions of the electron gas. In contrast, the second phase, the localized one, is realized at a strong modulation of the electron concentration profiles when the gated regions of the electron gas are completely depleted. Here, plasmon resonances are characterized by the spatial localization of absorption of incident radiation exclusively within the ungated regions of the electron gas. Moreover, in the localized phase, we observed the unexpected blue shift of plasmon resonant frequency with an increase of gate voltage. This observation was explained by the result of ‘edge gating effect’ and additional shrinking of the concentration profile of the electron gas in the ungated region. We demonstrate that the correct description of both phases requires rigorous electrodynamic simulations and cannot be achieved solely in the frameworks of simplified single-mode or single-cavity models.

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Section: Introductionmentioning

confidence: 99%

THz properties of grating-gate plasmonic crystals

Sai,

Dub,

Korotyeyev

et al. 2023

physics

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“…Other effects considered for potential THz sources include transit-time [6,7] as well as travelling-wave-and Cherenkov-type instabilities [8,9,10]. Recent studies on electrically-driven 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%

“…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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“…Latter can be solved, for example, using Galerkin schemes with guaranteed convergence. The IE technique has been exploited for the different problems including investigations of 2D plasmon instabilities under the grating [8,19,20], detection of THz radiation [21][22][23] and interaction of THz radiation with conductive-strip gratings [24,25]. In spite of apparent advantages with respect to fast convergence, this method is typically formulated for modeling structures with simple geometries and grating is treated as delta-thin.…”

Section: Introductionmentioning

confidence: 99%

Modified rigorous coupled-wave analysis for grating-based plasmonic structures with delta-thin conductive channel. Far- and near-field study

Lyaschuk,

Kukhtaruk,

Janonis

et al. 2021

Preprint

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The modified rigorous coupled-wave analysis technique is developed to describe the optical characteristics of the plasmonic structures with the grating-gated delta-thin conductive channel in the far-and near-field zones of electromagnetic waves. The technique was applied for analysis of the resonant properties of AlGaN/GaN heterostructures combined with deeply-subwavelength metallic grating which facilitates the excitation of the two-dimensional plasmons in the THz frequency range. The convergence of the calculations at the frequencies near the plasmon resonances is discussed. The impact of the grating's parameters, including filling factor and thickness of the grating, on resonant absorption of the structure was investigated in details. The spatial distributions of electromagnetic field in a near-field zone were used for the evaluation of total absorption of the plasmonic structures separating contributions of the grating-gated two-dimensional electron gas and the grating coupler.

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Plasma wave oscillations in a nonequilibrium two-dimensional electron gas: Electric field induced plasmon instability in the terahertz frequency range

Cited by 8 publications

References 61 publications

THz properties of grating-gate plasmonic crystals

THz properties of grating-gate plasmonic crystals

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

Modified rigorous coupled-wave analysis for grating-based plasmonic structures with delta-thin conductive channel. Far- and near-field study

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