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09:49
An Experimental Protocol for Femtosecond NIR/UV - XUV Pump-Probe Experiments with Free-Electron Lasers
Published on: October 23, 2018
Photoemission electron microscopy using extreme ultraviolet attosecond pulse trains
A Mikkelsen1, J Schwenke, T Fordell
1Department of Physics, Lund University, Box 118, 22100 Lund, Sweden.
The Review of Scientific Instruments
|January 12, 2010
Summary
This study introduces a novel imaging technique combining photoemission electron microscopy (PEEM) with extreme ultraviolet (XUV) attosecond pulses for high-resolution imaging. The setup successfully imaged nanoscale features and observed electron emission dynamics.
Area of Science:
- Ultrafast science
- Surface science
- Advanced microscopy
Background:
- High spatial resolution is crucial for nanoscale imaging.
- Attosecond temporal resolution enables probing ultrafast dynamics.
Purpose of the Study:
- To demonstrate a new imaging method combining PEEM and XUV attosecond pulses.
- To investigate the imaging capabilities and limitations of this combined technique.
- To explore pump-probe experiments with ultrafast electron emission.
Main Methods:
- Utilized high-harmonic generation for extreme ultraviolet (XUV) attosecond pulse trains.
- Employed photoemission electron microscopy (PEEM) for imaging.
- Implemented a pump-probe setup with femtosecond infrared (IR) and XUV pulses.
Main Results:
- Achieved imaging of lithographic structures and Au nanoparticles with sub-300 nm resolution.
- Addressed space charge effects by optimizing pulse intensity.
- Observed multiphoton electron emission induced by IR pump pulses.
Conclusions:
- The combined PEEM-XUV attosecond pulse technique shows promise for nanoscale imaging and ultrafast dynamics studies.
- Electron energy filtering is identified as a key area for future resolution improvement.
- The pump-probe capability opens avenues for studying light-matter interactions at the attosecond timescale.
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