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Area of Science:

  • Optics and Nanophotonics
  • Ultrafast Electron Microscopy
  • Light-Matter Interactions

Background:

  • Light-matter interactions are governed by electron electrodynamic responses on sub-wavelength and sub-cycle scales.
  • Current ultrafast electron microscopy (UEM) lacks the necessary time resolution (femtosecond) to capture light cycle dynamics.
  • Understanding these dynamics is crucial for advancements in optics and nanophotonics.

Purpose of the Study:

  • To advance transmission electron microscopy (TEM) to achieve attosecond time resolution for optical responses.
  • To enable the study of material responses within a single cycle of excitation light.
  • To visualize electromagnetic near-fields in space and time.

Main Methods:

  • Modulating electron wave functions into rapid pulses using a continuous-wave laser.
  • Employing an energy filter in TEM to resolve electromagnetic near-fields.
  • Applying the technique to nanostructured materials like needle tips, dielectric resonators, and metamaterial antennas.

Main Results:

  • Attosecond time resolution achieved in electron microscopy, capturing dynamics within one optical cycle.
  • Observed phenomena include directional chiral surface wave launch, delayed dipole-quadrupole dynamics, subluminal waveguide fields, and multi-antenna responses.
  • Demonstrated visualization of electromagnetic near-fields as a space-time movie.

Conclusions:

  • The developed technique bridges the gap between electron microscopy and attosecond science for studying light-matter interactions.
  • Provides unprecedented insight into fundamental light-matter interactions at their intrinsic spatial and temporal scales.
  • Opens new avenues for designing and controlling light-matter interactions in nanophotonics.