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Evanescent Mode Photoemission.

Ragib Ahsan1, Alimohammed Kachwala2,3, Hyun Uk Chae1

  • 1Department of Electrical and Computer Engineering, University of Southern California, Los Angeles, California 90089, United States.

Nano Letters
|October 13, 2025
PubMed
Summary
This summary is machine-generated.

Researchers developed evanescent mode photoemission, a novel technique using waveguides to emit electrons. This method allows detailed visualization of optical modes and precise electron beam shaping for advanced nanoscale applications.

Keywords:
Electron SourcesEvanescent CouplingPhotoemissionWaveguide Modes

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Area of Science:

  • Solid-state physics
  • Optoelectronics
  • Nanotechnology

Background:

  • Photoemission is crucial for electron emission from surfaces using light.
  • Existing reflection and transmission modes have limitations.
  • Cesium antimonide offers high quantum efficiency for photoemission.

Purpose of the Study:

  • To introduce and demonstrate evanescent mode photoemission.
  • To enable direct visualization of guided optical modes.
  • To achieve precise electron beam shaping at the nanoscale.

Main Methods:

  • Integrating silicon nitride waveguides beneath a cesium antimonide thin film.
  • Utilizing evanescent coupling of light from the waveguide into the thin film.
  • Analyzing photoemitted electrons for mode visualization and beam characteristics.

Main Results:

  • Demonstrated a new photoemission regime: evanescent mode photoemission.
  • Enabled visualization of guided optical modes from ~100 nm to 1 mm.
  • Achieved electron beam shaping with transverse features below ~600 nm.

Conclusions:

  • Evanescent mode photoemission is a novel and effective technique.
  • This method provides a new platform for nanoscale optical field mapping.
  • It offers precise control for generating tailored electron beams.