The laser assisted field electron emission from carbon nanostructure

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/cm 2 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.

Ultrafast Field‐Emission Electron Sources Based on Nanomaterials

“…They then face a much narrower tunneling barrier, meaning that the tunneling probability is greatly increased, which results in a highly enhanced emission current. The laser‐assisted emission from nanostructures can be analyzed in the framework of the two‐temperature model, which describes the experimental results in terms of coupling between electron and lattice systems. Upon irradiation of the emitter material with an intense laser, the energy of the photons is transferred to the electrons, creating an ensemble of hot electrons.…”

“…A turn‐on field (normally defined as the electric field required to produce an emission current density of 1 µA cm −2 ) of 2.3 V µm −1 and a large field‐enhancement factor of 3700 were obtained, along with good emission stability and uniformity. Recently, Lyashenko et al presented a study of femtosecond laser‐assisted field emission from vertically aligned graphene films, which indicated graphene as a promising ultrafast field emitter. The experimental results can be explained by the two‐temperature model considering laser heating of the electrons and energy exchange with the lattice.…”

Introductory Chapter: Carbon Nanotubes and Their Applications

“…Such dense and short electron bunches can become a popular platform for material and device imaging, inspection, and Carbon Nanotubes -Recent Progress failure analysis. They would enable exciting technological developments like four-dimensional time resolved electron microscopy, spectroscopy, holography, single-electron sources, and carrier envelope phase detection [21,22]. Many other investigations in terms of electrode materials are focused on CNTs and their modified or hybrid materials.…”

Carbon Nanotubes as a Pulsed Electron Sources

“…Laser-induced field emission could offer opportunities for dramatic improvements in performance of electronic devices due to the possibility of manipulation and control of coherent electron motion in ultrafast spatiotemporal scales [8,21]. As one of the most important cold cathode materials, CNTs have been widely studied.…”

“…Such dense and short electron bunches can become a popular platform for material and device imaging, inspection, and failure analysis. They would enable exciting technological developments like four-dimensional (4D) time resolved electron microscopy, spectroscopy, holography, single-electron sources, and carrier envelope phase detection [7,8]. Besides, pulsed electron sources are also becoming a hot topic in fields of medicine, physics, chemistry, industry, and communication, both in military and domestic industries.…”