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Cathodoluminescence in Ultrafast Electron Microscopy.

Ye-Jin Kim1,2, Oh-Hoon Kwon1,2

  • 1Department of Chemistry, College of Natural Sciences, Ulsan National Institute of Science and Technology, Ulsan 44919, Korea.

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|December 13, 2021
PubMed
Summary
This summary is machine-generated.

We developed cathodoluminescence-ultrafast electron microscopy (CL-UEM) to study nanoscale light emission. This technique reveals how color centers in nanodiamonds emit light with high spatial and temporal precision.

Keywords:
carrier transfercathodoluminescencenanodiamondsnitrogen-vacancy color centerstime-resolved spectroscopyultrafast electron microscopywide-bandgap materials

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Area of Science:

  • Materials Science
  • Quantum Optics
  • Nanotechnology

Background:

  • Understanding nanoscale light emission is crucial for advanced technologies like quantum information processing.
  • Current methods lack the spatiotemporal resolution to probe energy and information flow dynamics.

Purpose of the Study:

  • To develop and demonstrate a novel technique combining cathodoluminescence (CL) and ultrafast electron microscopy (UEM).
  • To investigate the structure-function relationships of color centers in nanodiamonds at sub-optical scales.

Main Methods:

  • Integration of cathodoluminescence (CL) spectroscopy with ultrafast electron microscopy (UEM) into a single technique (CL-UEM).
  • High-energy electron beam excitation of color centers in nanodiamonds.
  • Measurement of CL lifetime with 50 nm spatial sensitivity and 100 ps time resolution.

Main Results:

  • Demonstrated CL-UEM for precise measurement of CL lifetime in nanodiamonds.
  • Revealed charge transfer mechanisms populating emitting states of color centers via electron beam excitation.
  • Established local sensitivity of 50 nm and time resolution of 100 ps.

Conclusions:

  • CL-UEM provides unprecedented spectral and spatiotemporal resolution for nanoscale optoelectronic materials.
  • The findings offer insights into energy conversion mechanisms relevant to quantum dots and single-photon sources.
  • This technique enables specific control over nanoscale energy conversion processes.