Journal article 1435 views 125 downloads
Velocity map imaging of femtosecond laser induced photoelectron emission from metal nanotips
New Journal of Physics, Volume: 16, Issue: 10, Start page: 103031
Swansea University Author:
William Bryan
-
PDF | Version of Record
Content from this work may be used under the terms of the Creative Commons Attribution 3.0 licence (https://creativecommons.org/licenses/by/3.0/). Any further distribution of this work must maintain attribution to the author(s) and the title of the work, journal citation and DOI
Download (1.16MB)
DOI (Published version): 10.1088/1367-2630/16/10/103031
Abstract
A novel application of velocity-map imaging (VMI) is demonstrated, whereby the momentum distribution of photoelectrons ejected from a tungsten nanoscale metal tip (< 50 nm radius) is recorded following illumination with an ultrafast laser pulse. The electrostatic conditions in the VMI instrument...
| Published in: | New Journal of Physics |
|---|---|
| Published: |
2014
|
| Online Access: |
http://iopscience.iop.org/1367-2630/16/10/103031 |
| URI: | https://cronfa.swan.ac.uk/Record/cronfa20244 |
| Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
| Abstract: |
A novel application of velocity-map imaging (VMI) is demonstrated, whereby the momentum distribution of photoelectrons ejected from a tungsten nanoscale metal tip (< 50 nm radius) is recorded following illumination with an ultrafast laser pulse. The electrostatic conditions in the VMI instrument are optimized through finite element modelling, taking into account a physically realistic geometry including all conductive elements in the vicinity of the electron trajectories. The instrument is calibrated by observing above threshold ionization in krypton gas, and simultaneous electron emission from this gas and a tungsten nanotip is presented, illustrating that the velocity mapping condition is maintained. Realizing photoelectron VMI for femtosecond laser illuminated nanoscale objects will have a significant impact on the emerging field of ultrafast nanoplasmonics and will influence the development of such devices as a source of coherent pulses of electrons with applications in time-resolved microscopy, holography and diffractive imaging. |
|---|---|
| Keywords: |
velocity map imaging, nanotip, tunnel ionization, ultrafast photoelectron spectroscopy |
| College: |
Faculty of Science and Engineering |
| Issue: |
10 |
| Start Page: |
103031 |