A High-Current-Density Terahertz Electron-Optical System Based on Carbon Nanotube Cold Cathode

Gu, Yuandong; Yuan, Xuesong; Xu, Xiaotao; Cole, Matthew T.; Chen, Qing‐Yun; Wang, Bin; Li, Hailong; Yin, Yong; Yan, Yang

doi:10.1109/ted.2020.3031871

Cited by 7 publications

(2 citation statements)

References 31 publications

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“…CFE from CNTs is also of great practical interest, since high-efficiency cathodes can be created on the basis of CNTs, which open up the possibility of developing a new generation of the microwave and THz components for micro-and nano-solid state and vacuum electronics, including generators, detectors etc. [7,8,[14][15][16][17][18][19] and also the review [20]. The emission of single electrons from individual CNTs makes it possible to create the single-electron devices, which are necessary for quantum technologies [21].…”

Section: Introductionmentioning

confidence: 99%

Structural Inhomogeneities and Nonlinear Phenomena in Charge Transfer under Cold Field Emission in Individual Closed Carbon Nanotubes

Kosakowski¹,

Коледов²,

Шавров³

et al. 2023

Preprint

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The structure and phenomena arising from charge transfer in cold field emission modus in a single closed carbon nanotube under cold field emission conditions were studied. By studying microphotographs in various microscopes - AFM, SEM, TEM it was found inhomogeneities in the form of two types of superlattices. The conductivity of the emitter section of a nanodiode circuit with an emitter made of an individual closed carbon nanotube (CNT) and arrays of closed CNTs was studied. High values of cold field emission were observed, as well as nonlinearity and anomalies of the current-voltage characteristic (I-V characteristics), which manifested themselves in the form of peaks at low and high current values. Peaks in the CVC have distinct areas of negative differential conductivity. It is argued, that the anomalously high currents in the I–V characteristics of cold field emission of electrons from a nanoemitter made of closed CNTs can be associated with a sharp increase in the density of electron states at energies near the van Hove singularity.

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Section: Introductionmentioning

confidence: 99%

Structural Inhomogeneities and Nonlinear Phenomena in Charge Transfer under Cold Field Emission in Individual Closed Carbon Nanotubes

Kosakowski¹,

Коледов²,

Шавров³

et al. 2023

Preprint

View full text Add to dashboard Cite

show abstract

“…CFE from CNTs is also of great practical interest, since high-efficiency cathodes can be created on the basis of CNTs, which open up the possibility of developing a new generation of microwave and THz components for micro-and nano-solid state and vacuum electronics, Micro 2023, 3 942 including generators, detectors, etc. [7,8,[14][15][16][17][18][19][20]. The emission of single electrons from individual CNTs makes it possible to create single-electron devices, which are necessary for quantum technologies [21][22][23].…”

Section: Introductionmentioning

confidence: 99%

Structural Inhomogeneities and Nonlinear Phenomena in Charge Transfer under Cold Field Emission in Individual Closed Carbon Nanotubes

von Gratowski,

Kosakovskaya,

Koledov

et al. 2023

Micro

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The structure and phenomena arising from charge transfer in cold field emission mode in a single closed carbon nanotube (CNT) under cold field emission conditions are studied. Inhomogeneities of the structure of CNT in the form of two types of superlattices are found by studying microphotographs obtained by AFM, SEM, and TEM. The features of charge transfer in a quasi-one-dimensional carbon nanotube emitter with a small gap between the anode and cathode are studied under conditions of low-voltage field emission. It is established that the I-V characteristics reveal voltage thresholds and resonant peaks, which are associated with the opening of conduction channels in the region of van Hove singularities. In the region of peaks in the I-V characteristics, the emission current exceeds the one calculated using the Fowler–Nordheim (F-N) function by one to three orders of magnitude. The I-V characteristic is not that the curve straightens in F-N coordinates. It is found that the peaks in the I-V characteristics have distinct regions of negative differential conductivity.

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A ridge-loaded staggered double-vane slow wave structure for terahertz radiation sources

Latif,

Wang,

Jameel

et al. 2024

Sci Rep

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A ridge-loaded staggered double-vane slow-wave structure is proposed for terahertz radiation sources employing a sheet electron beam. This slow-wave structure has the advantages of enhanced electric field and energy density distribution and improved interaction impedance in the beam-wave interaction region. High-frequency characteristics are investigated for the proposed slow wave structure and compared with those of the staggered double-vane slow wave structure. The slow wave structure is fabricated and experimentally tested for transmission and reflection properties, revealing $$S_{21}$$ above -2 dB and $$S_{11}$$ below -17 dB at 0.34 THz for a backward wave oscillator. Steady transmission of the 21.7 kV sheet electron beam is achieved by designing a periodic cusped magnetic system (0.2 T) along with a sheet electron beam gun (50 mA). Beam-wave interaction simulations utilizing 100 periods demonstrate a peak power of 14 W and continuous frequency tuning from 0.295-0.375 THz for the proposed slow wave structure, whereas the staggered double-vane slow wave structure achieves 8.5 W peak power and frequency tuning from 0.308-0.366 THz. The sensitivity of the output power to the added ridge geometry is also analyzed. These findings indicate that the novel ridge-loaded staggered double vane slow-wave structure is promising for developing high-power broad frequency tunable terahertz radiation sources.

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A High-Current-Density Terahertz Electron-Optical System Based on Carbon Nanotube Cold Cathode

Cited by 7 publications

References 31 publications

Structural Inhomogeneities and Nonlinear Phenomena in Charge Transfer under Cold Field Emission in Individual Closed Carbon Nanotubes

Structural Inhomogeneities and Nonlinear Phenomena in Charge Transfer under Cold Field Emission in Individual Closed Carbon Nanotubes

Structural Inhomogeneities and Nonlinear Phenomena in Charge Transfer under Cold Field Emission in Individual Closed Carbon Nanotubes

A ridge-loaded staggered double-vane slow wave structure for terahertz radiation sources

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