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Related Experiment Videos

Laser-assisted photoelectric effect from surfaces.

L Miaja-Avila1, C Lei, M Aeschlimann

  • 1Department of Physics and JILA, University of Colorado, Boulder, Colorado 80309-0440, USA.

Physical Review Letters
|October 10, 2006
PubMed
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Researchers observed the laser-assisted photoelectric effect on a platinum surface. This new method precisely measures ultrashort extreme ultraviolet pulses, enabling studies of ultrafast electron dynamics.

Area of Science:

  • Solid-state physics
  • Quantum optics
  • Surface science

Background:

  • The photoelectric effect is fundamental to understanding electron emission from materials.
  • Measuring ultrashort light pulses is crucial for studying ultrafast phenomena.
  • Existing methods for measuring extreme ultraviolet (XUV) pulse durations have limitations at higher photon energies.

Purpose of the Study:

  • To report the first observation of the laser-assisted photoelectric effect (LAPE) from a solid surface.
  • To demonstrate LAPE as a novel cross-correlation technique for measuring XUV pulse durations.
  • To explore the potential of LAPE for investigating femtosecond-to-attosecond electron dynamics.

Main Methods:

  • Simultaneous illumination of a Platinum (Pt(111)) sample with ultrashort 1.6 eV laser and 42 eV extreme ultraviolet (XUV) pulses.

Related Experiment Videos

  • Analysis of sideband structures in the XUV photoemission spectrum.
  • Time-delay-dependent measurements of sideband magnitudes to characterize XUV pulse duration.

    • Main Results:

    • Successful observation of sidebands in the XUV photoemission spectrum, confirming the laser-assisted photoelectric effect.
    • Demonstration that the magnitude of these sidebands provides a cross-correlation measurement of the XUV pulse.
    • The observed effect is sensitive to the temporal overlap between the laser and XUV pulses.

    Conclusions:

    • The laser-assisted photoelectric effect is a viable new technique for measuring XUV pulse durations.
    • This method can extend pulse duration measurements to higher photon energies.
    • LAPE opens new avenues for studying ultrafast electron dynamics in condensed matter and surface systems.