Results 31 to 40 of about 675,095 (343)

All-optical spatio-temporal control of electron emission from SiO2 nanospheres with femtosecond two-color laser fields [PDF]

, 2019
Field localization by nanostructures illuminated with laser pulses of well-defined waveform enables spatio-temporal tailoring of the near-fields for sub-cycle control of electron dynamics at the nanoscale.
Ahn, Seongjin, Liu, Qingcao, Rupp, Philipp, Rühl, Eckart, Seiffert, Lennart, Skruszewicz, Slawomir, Sun, Shaohua [u.v.m.], Wnuk, Pawel, Zherebtsov, Sergey, Zietlow, Dominik   +9 more
core   +1 more source

A high-brightness large-diameter graphene coated point cathode field emission electron source

Nature Communications, 2018
Traditional cold field emission electron sources rely on single crystal tungsten sharpened wires. Here, the authors use graphene-coated nickel point cathodes to devise alternative cold field emission electron sources for electron microscopy and ...
Xiuyuan Shao, Avinash Srinivasan, Wei Kean Ang, Anjam Khursheed   +3 more
doaj   +1 more source

Electron emission from conduction band of diamond with negative electron affinity

, 2019
Experimental evidence explaining the extremely low-threshold electron emission from diamond reported in 1996 has been obtained for the first time. Direct observation using combined ultraviolet photoelectron spectroscopy/field emission spectroscopy (UPS ...
Koe, Julian, Kudo, Masato, Kudo, Yuki, Masuzawa, Tomoaki, Nozue, Shuho, Okano, Ken, Saito, Ichitaro, Takakuwa, Yuji, Yamada, Takatoshi, Yamaguchi, Hisato   +9 more
core   +1 more source

Field - free and field - stimulated electron emission from solids [PDF]

Brazilian Journal of Physics, 1999
Electron irradiation of solids produces a backemission of secondary electrons (energies between 0 and 50 eV) and reflected primaries (energies between 50 eV and that of the incident beam). For insulators, it is shown that an externally applied positive electric field penetrating into the solid material, energizes electrons generated by the primary ...
Gross, Bernhard, Pintão, Carlos A. F., Hessel, Roberto   +2 more
openaire   +4 more sources

Enhanced Field Electron Emission from Photocurrent Treated Nanostructured Indium Oxide Films

MATEC Web of Conferences, 2018
Field electron emission currents from nanostructured films always have unsatisfied stability. This paper introduces a photocurrent treatment technique to enhance the filed emission properties, and gives a kind of nanostructured indium oxide film suitable
Li Zhenglin, Si Fuyuan, Wang Miaomiao, He Weigang, Zhang Yuwei   +4 more
doaj   +1 more source

Field Emission Cathodes to Form an Electron Beam Prepared from Carbon Nanotube Suspensions

Micromachines, 2020
In the first decade of our century, carbon nanotubes (CNTs) became a wonderful emitting material for field-emission (FE) of electrons. The carbon nanotube field-emission (CNT-FE) cathodes showed the possibility of low threshold voltage, therefore low ...
Karolina Urszula Laszczyk
doaj   +1 more source

Relaxation of hot electrons in a degenerate two-dimensional electron system: transition to one-dimensional scattering

, 2011
The energy relaxation channels of hot electrons far from thermal equilibrium in a degenerate two-dimensional electron system are investigated in transport experiments in a mesoscopic three-terminal device.
B. Kramer, C. Tomaras, D. Pines, D. Taubert, G. Baym, G. Giuliani, G. J. Schinner, H. P. Tranitz, M. P. A. Fisher, S. Kehrein, S. Ludwig, T. Giarmarchi, W. Wegscheider   +12 more
core   +1 more source

Investigation of Influencing Factors on the Measurement Signal of a CMOS Image Sensor for Measuring Field Emission Currents

Sensors
We use optical CMOS image sensors for spatially and time-resolved measurement of the emission currents of field emission cathodes. The measured signal depends, on the one hand, on the emission current that flows from the cathode surface through the ...
Matthias Hausladen, Andreas Schels, Ali Asgharzade, Philipp Buchner, Mathias Bartl, Dominik Wohlfartsstätter, Simon Edler, Michael Bachmann, Rupert Schreiner   +8 more
doaj   +1 more source

Nonlinear Compton scattering in ultra-short laser pulses

, 2011
A detailed analysis of the photon emission spectra of an electron scattered by a laser pulse containing only very few cycles of the carrying electromagnetic field is presented.
Di Piazza, A., Mackenroth, F.
core   +1 more source

Ultrafast Field‐Emission Electron Sources Based on Nanomaterials [PDF]

Advanced Materials, 2019
AbstractThe search for electron sources with simultaneous optimal spatial and temporal resolution has become an area of intense activity for a wide variety of applications in the emerging fields of lightwave electronics and attosecond science. Most recently, increasing efforts are focused on the investigation of ultrafast field‐emission phenomena of ...
Shenghan Zhou, Ke Chen, Matthew Thomas Cole, Zhenjun Li, Jun Chen, Chi Li, Qing Dai   +6 more
openaire   +2 more sources