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Ultrashort Pulses for Far-Field Nanoscopy.

Patrick Maurer1,2, J Ignacio Cirac3, Oriol Romero-Isart1,2

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Ultrashort laser pulses can achieve nanoscale focusing. This enables excitation of quantum systems with intensity-dependent probability, paving the way for nanoscale imaging via fluorescence detection.

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Area of Science:

  • Quantum Optics
  • Ultrafast Science
  • Nanophotonics

Background:

  • Ultrashort pulses exhibit unique spectral properties enabling nanoscale focusing.
  • Light-matter interactions in the ultrafast regime are governed by quantum electrodynamics.

Purpose of the Study:

  • To demonstrate nanoscale focusing of ultrashort pulses.
  • To investigate the excitation dynamics of two-level systems interacting with broadband ultrashort pulses.
  • To explore the potential of ultrafast light-matter interactions for nanoscale imaging.

Main Methods:

  • Theoretical analysis of ultrashort pulse focusing and spectral properties.
  • Quantum electrodynamical calculations of light-matter interaction, including counterrotating terms.
  • Modeling of excitation probability dependence on field intensity for two-level systems.

Main Results:

  • Ultrashort pulses can be focused to a spot size determined by their spectral width, reaching the nanometer scale for attosecond pulses.
  • A two-level system can be excited by ultrashort pulses with spectral widths exceeding the transition frequency.
  • Excitation probability depends on field intensity, not amplitude, due to the crucial role of counterrotating terms in quantum electrodynamics.
  • The excitation profile mirrors the nanoscale spot size of the ultrashort pulse.

Conclusions:

  • The intensity-dependent excitation probability in the ultrafast regime is a key quantum electrodynamical effect.
  • Coherent attosecond pulse trains offer potential for nanoscale excitation of fluorescent markers.
  • This research suggests a novel far-field light nanoscopy technique based on ultrafast excitation and fluorescence detection.