Young's Interference of Electrons in Field Emission Patterns

Oshima, C.; Mastuda, K.; Kona, Takayuki; Mogami, Y.; Komaki, M.; Murata, Yumi; Yamashita, Takumi; Kuzumaki, Tôru; Horiike, Yasuhiro

doi:10.1103/physrevlett.88.038301

Cited by 57 publications

(53 citation statements)

References 9 publications

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“…Field emission from metallic tips with nanometer sharpness has been introduced some time ago as highly bright and coherent electron source [1][2][3][4][5][6][7][8]. Only recently, pulsed electron sources with high spatio-temporal resolution were realized by laser-induced field emission from such tips [9][10][11][12].…”

Section: Introductionmentioning

confidence: 99%

Laser-induced field emission from a tungsten tip: Optical control of emission sites and the emission process

et al. 2010

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Field-emission patterns from a clean tungsten tip apex induced by femtosecond laser pulses have been investigated. Strongly asymmetric field-emission intensity distributions are observed depending on three parameters: (1) the polarization of the light, (2) the azimuthal and (3) the polar orientation of the tip apex relative to the laser incidence direction. In effect, we have realized an ultrafast pulsed field-emission source with site selectivity of a few tens of nanometers. Simulations of local fields on the tip apex and of electron emission patterns based on photo-excited nonequilibrium electron distributions explain our observations quantitatively. Electron emission processes are found to depend on laser power and tip voltage. At relatively low laser power and high tip voltage, field-emission after two-photon photo-excitation is the dominant process. At relatively low laser power and low tip voltage, photoemission processes are dominant. As the laser power increases, photoemission from the tip shank becomes noticeable.

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Section: Introductionmentioning

confidence: 99%

Laser-induced field emission from a tungsten tip: Optical control of emission sites and the emission process

et al. 2010

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“…In 1998, we reported that the energy spread of electrons emitted from a superconducting Nb tip is one order of magnitude lower than those of the conventional field emission (FE) tip [1] and nano-scaled tip of carbon nanotubes exhibits large improvement of the spatial coherence length because of the narrow emission area, ∼1 nm [2]. Since the narrowest electron source is a single-atom electron source, Fink fabricated it by remolding techniques [3], and Binh et al developed a surface melting method to construct a nano-protrusion terminated with a single atom [4].…”

Section: Introductionmentioning

confidence: 99%

Demountable Single-Atom Electron Source

Oshima

Rokuta

Itagaki³

et al. 2005

e-J. Surf. Sci. Nanotechnol.

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We report emission properties of single-atom tips, noble electron sources terminated with a single atom. The repairing function of the sources, which had been already demonstrated by using field ion microscope [Fu, et al. Phys. Rev. B 64, 113401 (2001)], was confirmed by using field emission microscopy, and in addition, the demountable character was demonstrated repeatedly. The brightness of the collimated beam emitted from the single-atom tips was estimated to be an order of 10 10 A/cm 2 /str. (E ∼ 2 keV), which is two orders of magnitude higher than those of the conventional field emission sources. There appeared an extra shoulder in the energy spectra, which is strongly correlated with a single-atom ended structure. The fluctuation of the emission current exhibited stepand spike-like noises, which were typical features of nano-electron sources. The single-atom sources are promising candidates of the electron sources in high-performance electron-beam instruments.

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“…After adsorption of a hydrogen molecule, such symmetries disappear and the field emission patterns change drastically. It is noted that our simulation results are obtained in the very vicinity of CNT tips, without considering any interference in the magnification of current distributions in FEM experiments [12], which is beyond the scope of this study. However, the strong relation between simulated and experimental results supports the previous interpretation of the experiments [3,4] that the bright spots in FEM patterns from CNT tips with adsorbates are of signatures of atom adsorption onto CNTs and the adsorption site should be close to the bright spots.…”

Section: Resultsmentioning

confidence: 98%

Patterns of Field Electron Emission from Carbon Nanotubes: Ab Initio Simulations by Time-Dependent Density Functional Theory

Mori²,

Watanabe³

2014

Proceedings of the 12th Asia Pacific Physics Conference (APPC12)

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We present the theoretical field-emission (FE) patterns from pristine and H 2 -adsorbed carbon nanotubes (CNTs), using ab initio time-dependent density functional theory. The field-emitted electrons are treated in the equal footing with the electrons in the nanotubes and the spatial distributions of FE current densities are calculated directly by the time-propagated Kohn-Sham wave functions. The simulated results of pristine CNTs clearly show either five-fold or six-fold symmetries, corresponding to the symmetries of the features of pentagons on the CNT caps. Further simulations on the H 2 molecule adsorbed CNTs verify that the bright spots in the FE pattern are of signatures of atom adsorption onto CNTs, and the adsorption site should be close to the bright spots.

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Young's Interference of Electrons in Field Emission Patterns

Cited by 57 publications

References 9 publications

Laser-induced field emission from a tungsten tip: Optical control of emission sites and the emission process

Laser-induced field emission from a tungsten tip: Optical control of emission sites and the emission process

Demountable Single-Atom Electron Source

Patterns of Field Electron Emission from Carbon Nanotubes: Ab Initio Simulations by Time-Dependent Density Functional Theory

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