There is Plenty of Room for THz Tunneling Electron Devices Beyond the Transit Time Limit

Villani, Matteo; Clochiatti, Simone; Prost, W.; Weimann, Nils; Oriols, X.

doi:10.1109/led.2021.3049229

Cited by 6 publications

(4 citation statements)

References 23 publications

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“…Current challenges and possible future trends: The quest for higher power certainly will remain to be a dominant motivation for research in the years to come. Additionally, the continued exploitation of the inherently nonlinear response of the devices may lead to a further increase of the fundamental operation frequency and to the development of novel multipliers, mixers and other nonlinear devices [126]. With regard to the nonlinearity, triplebarrier RTDs may again find increased attention.…”

Section: Resonant Tunneling Diodesmentioning

confidence: 99%

Roadmap of Terahertz Imaging 2021

Valušis

Lisauskas

Yuan

et al. 2021

Sensors

191

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In this roadmap article, we have focused on the most recent advances in terahertz (THz) imaging with particular attention paid to the optimization and miniaturization of the THz imaging systems. Such systems entail enhanced functionality, reduced power consumption, and increased convenience, thus being geared toward the implementation of THz imaging systems in real operational conditions. The article will touch upon the advanced solid-state-based THz imaging systems, including room temperature THz sensors and arrays, as well as their on-chip integration with diffractive THz optical components. We will cover the current-state of compact room temperature THz emission sources, both optolectronic and electrically driven; particular emphasis is attributed to the beam-forming role in THz imaging, THz holography and spatial filtering, THz nano-imaging, and computational imaging. A number of advanced THz techniques, such as light-field THz imaging, homodyne spectroscopy, and phase sensitive spectrometry, THz modulated continuous wave imaging, room temperature THz frequency combs, and passive THz imaging, as well as the use of artificial intelligence in THz data processing and optics development, will be reviewed. This roadmap presents a structured snapshot of current advances in THz imaging as of 2021 and provides an opinion on contemporary scientific and technological challenges in this field, as well as extrapolations of possible further evolution in THz imaging.

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Section: Resonant Tunneling Diodesmentioning

confidence: 99%

Roadmap of Terahertz Imaging 2021

Valušis

Lisauskas

Yuan

et al. 2021

Sensors

191

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show abstract

“…As we will see in the results below, when the small-signal implies a finite small value of V A (but not infinitesimally small), the electron device is not linear at very high frequencies [50]. In a linear system, one can anticipate the output values…”

Section: Displacement Current Coefficient D (F ) (E T) In Oscillating...mentioning

confidence: 96%

“…For more details about the possibilities opened by the use of non-linearity in high frequency nanodevices, see Ref. [50].…”

Section: Displacement Current Coefficient D (F ) (E T) In Oscillating...mentioning

confidence: 99%

“…In addition, the effect of external magnetic fields on the dynamics of electron devices is something well studied in the literature [47][48][49]. In fact, at GHz or THz frequencies, not only the particle current, but also the displacement current [50][51][52] needs to be properly taken into account, which is not an easy task. The simplest solution is mixing an electrostatic quantum treatment for the electron transport with a compact model that includes not only resistors, but also capacitors and/or inductors to account, among others, for the displacement current component [35,36,52].…”

Section: Introductionmentioning

confidence: 99%

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THz displacement current in tunneling devices with coherent electron-photon interaction

Villani¹,

Destefani²,

Cartoixà³

et al. 2022

Preprint

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For frequencies comparable to the inverse of the electron transit time, the measured total current in electron devices needs to include not only the particle but also the displacement current. Typically, in most quantum transport simulators, the displacement current is ignored, or simply computed from Gauss' law involving only the longitudinal (zero rotational) electric field. In this work, the role of the transverse (zero divergence) electromagnetic field in the evaluation of the displacement current in resonant tunneling diodes is analyzed within either classical or quantum models of such fields. In the quantum case, the peaks of the original transmission coefficient, without interaction with photons, split into two new peaks due to the resonant electron-photon interaction leading to Rabi oscillations. Such phenomenon, that mimics known effects predicted by a Jaynes-Cummings model in closed systems, exemplifies how a full quantum treatment of electrons and electromagnetic fields opens unexplored paths for engineering new THz electron devices. The computational burden involved in the multi-time measurements of THz currents is minimized by invoking a Bohmian description of the lightmatter interaction. As an additional result, we show that the traditional transmission coefficient used to characterize DC quantum electron devices has to be substituted by a new displacement current coefficient in high frequency AC scenarios.

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Terahertz Wireless Communication Systems

Nissanov

Singh

2023

Antenna Technology for Terahertz Wireless Communication

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There is Plenty of Room for THz Tunneling Electron Devices Beyond the Transit Time Limit

Cited by 6 publications

References 23 publications

Roadmap of Terahertz Imaging 2021

Roadmap of Terahertz Imaging 2021

THz displacement current in tunneling devices with coherent electron-photon interaction

Terahertz Wireless Communication Systems

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