Abstract
We present experimental and theoretical study of the femtosecond light-assisted field electron emission from nanocarbon films. We demonstrate that irradiation with intense femtosecond laser pulse allows one to achieve electron emission density of up to 13 nC/cm2 at a moderate applied static electric filed. The developed model well describes obtained experimental results and allows us to visualize physical mechanisms including heating of electron gas, multiphoton photoionization, and the space charge formation, which are responsible for the observed phenomena.
Highlights
The electronic sources based on laser assisted electron emission have found applications in different fields of science and technology including particle accelerators [1], free electron lasers [2], and modern photovoltaic systems [3]
The laser assisted electron emission has opened a way towards the time resolved electron microscopy [4, 5] because electrical gating and source control enable time resolution down to picoseconds, while using optical control enables creation of electron pulses with duration down to tens of femtoseconds [6]
This paper reports experimental results and theoretical analysis aiming at the mechanism of the ultrashort laser pulse assisted electron emission from nanocarbon films (NCF)
Summary
The electronic sources based on laser assisted electron emission have found applications in different fields of science and technology including particle accelerators [1], free electron lasers [2], and modern photovoltaic systems [3]. The laser assisted electron emission has opened a way towards the time resolved electron microscopy [4, 5] because electrical gating and source control enable time resolution down to picoseconds, while using optical control enables creation of electron pulses with duration down to tens of femtoseconds [6]. Such dense and short electron bunches can resolve important problems in electron microscopy, X-ray microscopy, and time-resolved electron diffraction, which is of special interest for industry and science. Owing to their unique structure and relative simplicity of the fabrication process, NCF are promising for
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