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Revisiting the Photon-Drag Effect in Metal Films.

Jared H Strait1, Glenn Holland1, Wenqi Zhu1,2

  • 1Physical Measurement Laboratory, National Institute of Standards and Technology, Gaithersburg, Maryland 20899, USA.

Physical Review Letters
|September 7, 2019
PubMed
Summary
This summary is machine-generated.

The photon-drag effect in gold is influenced by adsorbed molecules, contrary to prior assumptions. This study reveals the effect

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Area of Science:

  • Physics
  • Materials Science
  • Optics

Background:

  • The photon-drag effect is a sensitive probe of radiation pressure mechanisms.
  • Gold, as a canonical Drude metal, is a key material for studying light-matter interactions.

Purpose of the Study:

  • To re-examine the photon-drag effect in gold.
  • To investigate the influence of adsorbed molecules on the photon-drag signal.
  • To clarify the intrinsic sign of the photon-drag effect.

Main Methods:

  • Experimental investigation of the photon-drag effect in gold.
  • Utilizing p-polarized light illumination in ambient air.
  • Analysis of signal changes due to adsorbed molecules.

Main Results:

  • The photon-drag signal in gold is sensitive to adsorbed molecules in ambient air, affecting both sign and magnitude.
  • Previous measurements using this effect may require reinterpretation.
  • The intrinsic sign of the photon-drag effect contradicts the intuitive model of direct momentum transfer to free electrons.

Conclusions:

  • Adsorbed molecules play a significant role in the observed photon-drag effect in gold.
  • A revised understanding of the photon-drag effect is needed, moving beyond simple momentum transfer models.
  • This work opens new avenues for utilizing the photon-drag effect as a sensitive surface probe.