Yu. F. Zakharchenko

ELECTRON FIELD EMISSION FROM NANOFILAMENT CARBON FILMS

Abstract Considerable field emission has been observed from the surface of nanofilament carbon structure films on various substrates (Si, quartz, glass): the density of emission current was up to 1 A/cm 2 while the electric field was about 100 V/μm. The ‘reconstruction’ and ‘inversion’ effects of field emission have also been observed on some structures after current breakdown.

Field emitter arrays on nanotube carbon structure films

We present the finding of newly performed experiments of considerable field emission from the films consisting of nanotube carbon structures. Density of emission current was up to 1–3 A/cm2, while in 20–100 V/μm electric field it was 0.1–1 mA/mm2.

Thin films consisting of carbon nanotubes as a new material for emission electronics

The investigation results for the emission characteristics of thin films composed of nanotube carbon structures are described. These films are shown to provide high field electron emission and substantial thermal electron emission even at low temperatures. They exhibit low electron work functions and ensure stable field emission under conditions of operating vacuum.

Influence of external factors on electron field emission from thin‐film nanofilament carbon structures

The influence of temperature and residual gas pressure on the field emission of thin‐film nanotube carbon structures has been studied. These structures are shown to exhibit low work functions. They are promising for fabrication of effective low‐voltage field emitters and low‐temperature thermal emitters.

Two‐stage distributed amplifier on field emitter arrays

A two‐stage distributed microwave amplifier with field emitter arrays is analyzed. It is shown to be capable of operating in the millimeter wavelength band and to provide better performance as compared with reported amplifier designs.

Analysis of the possibility of performing microelectronic microwave vacuum devices with extended interaction on field emitter arrays

The possibility of microminiature microwave vacuum devices with extended interaction to be designed on the base of field emitter arrays is considered theoretically. The optimal designs of planar slow‐wave systems on dielectric substrates and of edge field emitter arrays electron guns for such systems are defined. High coupling resistances achieved in the above structures with low acceleration voltages in a wide frequency range and electron beams formed with suitable electron trajectory spread prove the assimilation of microwave range to be possible by such devices, including the millimeter‐wavelength band.

Distributed microwave amplifier on field emitter arrays with a nonhomogeneous energy collector

The nonlinear characteristics of a new type of electrically tuned distributed amplifier on field emitter arrays are considered that involve an energy collector in the form of a periodically nonhomogeneous strip line. In contrast to standard amplifiers, this collector exhibits a higher gain and operates at lower currents.

Peculiarities of constructing planar microminiature current sources based on secondary emission cathode excited by an edge FEA

Abstract The current characteristics of a microminiature current source are theoretically studied. It is based on a secondary emission cathode excited by the current from a field emission array (FEA). This principle of constructing current sources allows the current from the FEA to be amplified by 10 times or more by using film materials which show high secondary emission coefficient, for example, MgO, Al 2 O 3 , and BeO. These features yield an opportunity for a substantially longer durability for a film FEA and the source as a whole.

Construction principles for multi-beam microwave power amplifier tubes with distributed transverse-extended interaction, using fea electron source

Abstract Construction principles for a low-voltage vacuum electronic microwaves average-power amplifier for millimeter waves with distributed transverse–extended interaction between an electron flow and the electromagnetic wave field are discussed which is based on multi-beam electron-optical systems containing matrix field emitter arrays. The characteristics of this amplifier are analyzed.

Simulation of field emission and electrodynamic characteristics for triode near-cathode modulators with edge field emitter arrays

On the basis of the theory of conformal transformations of complex functions, a method was developed to rigorously solve the electrostatic problem for two-dimensional diode and triode systems having edge arrays whose faces are formed by a periodic nano-dimensional array of field emitting centers. The method proposed is used to simulate the emission and electrodynamic characteristics of near-cathode megawatt triodelike modulators.