scholarly journals Об электронной эмиссии из фокальной области симметрично сходящейся поверхностной плазмонной волны на свободной поверхности металлической пленки

2020 ◽  
Vol 128 (8) ◽  
pp. 1179
Author(s):  
А.Б. Петрин
Keyword(s):  
Free Surface ◽  
Electric Field ◽  
Electron Emission ◽  
Main Part ◽  
Gold Film ◽  
Plane Electromagnetic Wave ◽  
Normal Component ◽  
Emission Current ◽  
Central Maximum ◽  
Plasmon Wave

Based on the theory of reflection of a plane electromagnetic wave from a plane-layered structure, the excitation and focusing of a radially converging surface plasmon wave on the free surface of a gold film in the Kretschmann scheme are considered. The distribution of the electric field in the vicinity of the focus on the free surface of the film is quantitatively studied. Based on this distribution and the theory of thermofield electron emission from a metal, the time averaged current of electron emission is estimated depending on the amplitude of the normal component of the electric field of the wave at the center of the focal distribution. It was shown that the main part of the emission current comes from a region around the focus center with a diameter of the order of a tenth of the working wavelength in vacuum, and a negligible part of the emission current comes from surrounding the central maximum of the diffraction rings.

scholarly journals Сравнительный анализ чувствительности оптических датчиков на поверхностных волнах, возбуждаемых по схеме Кречмана

2019 ◽  
Vol 127 (12) ◽  
pp. 1051
Author(s):  
А.Б. Петрин
Keyword(s):  
Free Surface ◽  
Surface Wave ◽  
Light Beam ◽  
Surface Plasmon ◽  
Optical Sensors ◽  
Layered Structure ◽  
Gold Film ◽  
Planar Surface ◽  
Surface Waveguide ◽  
Plasmon Wave

Based on the theory of reflection of a limited light beam from a plane-layered structure, the surface plasmon wave on the free surface of a gold film excited by the Kretschmann scheme is considered, as well as the surface wave in a planar surface waveguide for comparison. The sensitivity of optical sensors based on these surface waves is compared. Several methods are proposed for increasing the sensitivity of sensors based on surface waveguides. The necessary accuracy of manufacturing of the film thicknesses to obtain efficient sensors is estimated.

Enhanced field-emission properties of buckled α-borophene by means of Li decoration: a first-principles investigation

2018 ◽  
Vol 20 (22) ◽  
pp. 15139-15148 ◽  
Author(s):  
Bing Zheng ◽  
Liang Qiao ◽  
Hai-tao Yu ◽  
Qi-yue Wang ◽  
Ying Xie ◽  
...  
Keyword(s):  
Electric Field ◽  
External Electric Field ◽  
Field Emission ◽  
Potential Barrier ◽  
Electron Emission ◽  
First Principles ◽  
Emission Current ◽  
Emission Properties ◽  
Field Emission Properties ◽  
Field Emission Current

Li decoration and external electric field decrease the potential barrier to electron emission and increase field emission current of buckled α-borophene.

scholarly journals Field electron emission from a nanostructured tungsten surface

2021 ◽  
Vol 2064 (1) ◽  
pp. 012059
Author(s):  
P S Mikhailov ◽  
I L Muzyukin
Keyword(s):  
Electric Field ◽  
Electron Emission ◽  
Enhancement Factor ◽  
Field Enhancement ◽  
Sample Surface ◽  
Emission Current ◽  
Emission Area ◽  
Effective Emission Area ◽  
Tungsten Surface ◽  
Tungsten Anode

Abstract In this paper, the electron emission from a nanostructured tungsten surface was investigated. A method for measuring an extremely low current (10−12 – 10−14 A) has been tested. It made possible to reduce the effect of the electric field on the sample surface and to minimize the probability of spontaneous breakdowns. For a detailed study of tungsten fuzz, a point tungsten anode (diameter 90 μm) was used. Field enhancement factor (β = 2000 – 3000) and effective emission area were calculated using the Fowler–Nordheim plots. The pre-breakdown current rise was studied. The emission current waveforms suggest the formation of several emission structures before the breakdown.

scholarly journals О фокусировке поверхностных плазмонных волн на свободной поверхности металлической пленки

2019 ◽  
Vol 126 (3) ◽  
pp. 350
Author(s):  
А.Б. Петрин
Keyword(s):  
Electromagnetic Wave ◽  
Free Surface ◽  
Electric Field ◽  
Field Distribution ◽  
Layered Structure ◽  
Metal Film ◽  
Electric Field Distribution ◽  
Plane Electromagnetic Wave

AbstractThe excitation and focusing of a surface plasmonic wave on the free surface of a metal film in the Kretschmann scheme have been considered based on the theory of reflection of a plane electromagnetic wave from a flat-layered structure. A method of exciting a radially convergent surface plasmonic wave is proposed. The electric-field distribution at the focus is quantitatively investigated, and the conditions for its maximization are determined. The applications of the results obtained are discussed.

Effect of space charge on vacuum pre-breakdown voltage and electron emission current

2021 ◽  
Vol 129 (15) ◽  
pp. 155102
Author(s):  
B. Seznec ◽  
Ph. Dessante ◽  
Ph. Teste ◽  
T. Minea
Keyword(s):  
Space Charge ◽  
Breakdown Voltage ◽  
Electron Emission ◽  
Emission Current

Deepening of domains at e-beam writing on the -Z surface of lithium niobate

2021 ◽  
Author(s):  
Lyudmila Kokhanchik ◽  
Evgenii Emelin ◽  
Vadim Vladimirovch Sirotkin ◽  
Alexander Svintsov
Keyword(s):  
Surface Layer ◽  
Electron Beam ◽  
Lithium Niobate ◽  
Electric Field ◽  
Domain Walls ◽  
Normal Component ◽  
Beam Current ◽  
Near Surface ◽  
Domain Structures ◽  
Sign Inversion

Abstract The focus of the study was to investigate the peculiarities of the domains created by electron beam (e-beam) in a surface layer of congruent lithium niobate, which comparable to a depth of electron beam charge penetration. Direct e-beam writing (DEBW) of different domain structures with a scanning electron microscope was performed on the polar -Z cut. Accelerating voltage 15 kV and e-beam current 100 pA were applied. Different patterns of local irradiated squares were used to create domain structures and single domains. No domain contrast was observed by the PFM technique. Based on chemical etching, it was found that the vertices of the domains created do not reach the surface level. The average deepening of the domain vertices was several hundred nanometers and varied depending on the irradiation dose and the location of the irradiated areas (squares) relative to each other. Computer simulation was applied to analyze the spatial distribution of the electric field in the various irradiated patterns. The deepening was explained by the fact that in the near-surface layer there is a sign inversion of the normal component of the electric field strength vector, which controls the domain formation during DEBW. Thus, with the help of e-beam, domains were created completely located in the bulk, in contrast to the domains that are nucleated on the surface of the -Z cut during the polarization inversion with AFM tip. The detected deepening of e-beam domains suggests the possibility of creating the “head-to-head” domain walls in the near-surface layer lithium niobate by DEBW.

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