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Related Experiment Videos

Electromagnetic coupling on an atomic scale.

J Aizpurua1, G Hoffmann, S P Apell

  • 1National Institute of Standards and Technology, Gaithersburg, Maryland 20899-8423, USA.

Physical Review Letters
|October 9, 2002
PubMed
Summary
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Scanning tunneling microscopy light emission reveals electromagnetic coupling (EMC) between metal tips and samples. Subatomic changes alter fluorescence spectra, showing EMC is localized to a few nanometers for sharp tips.

Area of Science:

  • Surface science
  • Scanning probe microscopy
  • Optical spectroscopy

Background:

  • Electromagnetic coupling (EMC) is crucial for understanding tip-sample interactions in scanning tunneling microscopy (STM).
  • Light emission in STM (STM-induced luminescence) provides a sensitive probe of electronic and optical properties at the nanoscale.

Purpose of the Study:

  • To investigate the electromagnetic coupling (EMC) between a metal tip and a metal sample using light emission from STM.
  • To explore how subatomic scale modifications in the tip-sample region affect the spectral properties of fluorescence.

Main Methods:

  • Utilizing light emission from a scanning tunneling microscope to probe tip-sample interactions.
  • Inducing subatomic scale modifications, such as creating a monatomic step on the sample surface.

Related Experiment Videos

  • Varying the tip-sample distance to observe spectral shifts.

    • Main Results:

    • Subatomic modifications of the tip-sample region lead to spectral shifts in fluorescence.
    • Demonstrated spectral shifts for a monatomic step and by altering the tip-sample distance.
    • Observed that for sharp tips, the EMC is spatially confined to a lateral range of a few nanometers.

    Conclusions:

    • The study confirms the sensitivity of STM-induced luminescence to nanoscale geometric and electronic changes.
    • Results align with theoretical models of electromagnetic response for specific tip-sample geometries.
    • Provides insights into the spatial extent and sensitivity of electromagnetic coupling in STM.