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New luminescence scanning tunneling microscope with high detection efficiency.

A Reutter1, Y Hilgers1, M Stummvoll1

  • 1Institute of Applied Physics, TU Braunschweig, Germany and Laboratory for Emerging Nanometrology, TU Braunschweig, Germany.

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This summary is machine-generated.

We developed a new ultrahigh vacuum Scanning Tunneling Microscope (STM) for atomic-scale electroluminescence studies. This advanced setup significantly improves detection efficiency and count rates, enabling new molecular and materials research.

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Area of Science:

  • Atomic-scale physics
  • Materials science
  • Surface science

Background:

  • Scanning Tunneling Microscopy (STM)-induced luminescence is crucial for atomic-scale electroluminescence.
  • Past research faced challenges with low and unreliable count rates.
  • High detection efficiency is needed for advanced nanoscale studies.

Purpose of the Study:

  • To present a novel self-built STM for enhanced electroluminescence measurements.
  • To overcome limitations of previous STM setups in achieving high count rates.
  • To enable detailed studies of molecular excitonic behavior and sensitive emitters.

Main Methods:

  • Utilized an ultrahigh vacuum STM operating below 10 K.
  • Implemented a large parabolic mirror for efficient light collection (approx. 65%).
  • Employed free-beam optics, robust focusing, and high-frequency (≥16 GHz) cabling.

Main Results:

  • Achieved an order of magnitude higher detection efficiency than similar instruments.
  • Observed count rates up to 6 × 10^6 cps at 1 nA for Ag/Ag(111) surface plasmon polariton decay.
  • Demonstrated a photon-per-tunneling-electron conversion factor of ~10^-3.

Conclusions:

  • The enhanced STM setup significantly boosts luminescence detection efficiency and count rates.
  • High time resolution (<1 ns) allows for picosecond-range studies of molecular excitonic behavior.
  • The improved system facilitates complex experiments and the study of previously inaccessible sensitive emitters.