Electric field distribution on knife-edge field emitters

Miller, Ryan; Lau, Y. Y.; Booske, John H.

doi:10.1063/1.2771375

Cited by 91 publications

(70 citation statements)

References 12 publications

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“…We postulate that such a high value of field enhancement factor is due to microscopic features presence on the emitting surface of the field emitter, which dominates the emission. As explained by R. Miller et al, 29 the overall effective field enhancement factor of the emitter is multiplicative when the emission site is small compared to the supporting structure. 29,30 Figure 2 shows the I-V curves for four different configurations: A.)…”

Section: -5mentioning

confidence: 91%

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Field emission characteristics of a small number of carbon fiber emitters

et al. 2016

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This paper reports an experiment that studies the emission characteristics of small number of field emitters. The experiment consists of nine carbon fibers in a square configuration. Experimental results show that the emission characteristics depend strongly on the separation between each emitter, providing evidence of the electric field screening effects. Our results indicate that as the separation between the emitters decreases, the emission current for a given voltage also decreases. The authors compare the experimental results to four carbon fiber emitters in a linear and square configurations as well as to two carbon fiber emitters in a paired array. Voltage-current traces show that the turn-on voltage is always larger for the nine carbon fiber emitters as compared to the two and four emitters in linear configurations, and approximately identical to the four emitters in a square configuration. The observations and analysis reported here, based on Fowler-Nordheim field emission theory, suggest the electric field screening effect depends critically on the number of emitters, the separation between them, and their overall geometric configuration.

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Section: -5mentioning

confidence: 91%

“…As explained by R. Miller et al, 29 the overall effective field enhancement factor of the emitter is multiplicative when the emission site is small compared to the supporting structure. 29,30 Figure 2 shows the I-V curves for four different configurations: A.) two-fiber linear arrays with 500 µm separation, B.)…”

Section: -5mentioning

confidence: 91%

Field emission characteristics of a small number of carbon fiber emitters

et al. 2016

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“…For a protruding ridge as may likely exist on the surface of an emitting cathode, the field enhancement factor can easily be obtained through conformal mapping techniques. 22,23 Details have been discussed by our group 24,25 and field enhancements by factors in excess of 10 3 shown to result for an emitter height of 10 µm and a 20 nm width. Furthermore, the presence of an ion (whether due to a separate material ejection and its subsequent ionization, or in the plasma surrounding the cathode), would alter the surface electric fields and lower the barrier for electron tunneling.…”

Section: Model Analysismentioning

confidence: 99%

Heating based model analysis for explosive emission initiation at metal cathodes

et al. 2015

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This contribution presents a model analysis for the initiation of explosive emission; a phenomena that is observed at cathode surfaces under high current densities. Here, localized heating is quantitatively evaluated on ultrashort time scales as a potential mechanism that initiates explosive emission, based on a two-temperature, relaxation time model. Our calculations demonstrate a strong production of nonequilibrium phonons, ultimately leading to localized melting. Temperatures are predicted to reach the cathode melting point over nanosecond times within the first few monolayers of the protrusion. This result is in keeping with the temporal scales observed experimentally for the initiation of explosive emission. C 2015 Author(s). All article content, except where otherwise noted, is licensed under a Creative Commons Attribution 3.0 Unported License. [http://dx

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“…14, 15 The enhanced power loss due to surface and interface roughness exerts significant effects on signal integrity of microelectronic circuits. [16][17][18][19][20] Other effects due to surface roughness, such as local electric and magnetic field enhancements, may trigger RF-breakdown 5,8,11,[19][20][21][22][23] and abrupt quenching 2,7,9 (i.e., rapid loss of superconductivity) of a superconducting cavity.…”

Section: Introductionmentioning

confidence: 99%

Electromagnetic power absorption due to bumps and trenches on flat surfaces

Pérez‐Arancibia

Zhang

Bruno

et al. 2014

Journal of Applied Physics

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This paper presents a study of the absorption of electromagnetic power that results from the interaction of electromagnetic waves and cylindrical bumps or trenches on flat conducting surfaces. Configurations are characterized by means of adequately selected dimensionless variables and parameters so that applicability to mathematically equivalent (but physically diverse) systems can be achieved easily. Electromagnetic fields and absorption increments caused by such surface defects are evaluated by means of a high-order integral equation method which resolves fine details of the field near the surface, and which was validated by fully analytical approaches in a range of computationally challenging cases. The computational method is also applied to problems concerning bumps and trenches on imperfect conducting planes for which analytical solutions are not available. Typically, we find that absorption is enhanced by the presence of the defects considered, although, interestingly, absorption can also be significantly reduced in some cases-such as, e.g., in the case of a trench on a conducting plane where the incident electric field is perpendicular to the plane. Additionally, it is observed that, for some small-skin-depths large-wavelengths, the absorption increment is proportional to the increase in surface area. Significant physical insight is obtained on the heating that results from various types of electromagnetic incident fields. V C 2014 AIP Publishing LLC. [http://dx

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Electric field distribution on knife-edge field emitters

Cited by 91 publications

References 12 publications

Field emission characteristics of a small number of carbon fiber emitters

Field emission characteristics of a small number of carbon fiber emitters

Heating based model analysis for explosive emission initiation at metal cathodes

Electromagnetic power absorption due to bumps and trenches on flat surfaces

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