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Ultrafast imaging of terahertz electric waveforms using quantum dots.

Moritz B Heindl1, Nicholas Kirkwood2, Tobias Lauster3

  • 1Experimental Physics VIII - Ultrafast Dynamics, University of Bayreuth, Bayreuth, Germany.

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Summary

Quantum-probe Field Microscopy (QFIM) uses quantum dots to image ultrafast Terahertz electric fields with high resolution. This new method allows for in-operando imaging of nanodevices, overcoming limitations of existing techniques.

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Area of Science:

  • Condensed matter physics
  • Nanophotonics
  • Quantum optics

Background:

  • Microscopic electric fields are crucial for condensed matter excitations and Terahertz (THz) electronics.
  • Existing THz near-field imaging techniques face limitations in sample geometry, speed, and field strength.

Purpose of the Study:

  • To develop a novel method for resolving sub-wavelength electric fields in the THz regime.
  • To enable in-operando imaging of complex nanodevices at ultrafast timescales.

Main Methods:

  • Harnessing the quantum-confined Stark effect to encode electric fields into colloidal quantum dot luminescence.
  • Combining far-field visible photon imaging with phase-resolved sampling of electric waveforms.
  • Utilizing ultrafast movie capture for spatio-temporal field resolution.

Main Results:

  • Spatio-temporally resolved a THz resonance within a bowtie antenna.
  • Unveiled the sub-wavelength propagation of a THz waveguide excitation.
  • Demonstrated compatibility with strong-field excitation and sub-micrometer resolution.

Conclusions:

  • Quantum-probe Field Microscopy (QFIM) offers a new route for ultrafast electric field imaging.
  • QFIM overcomes limitations of previous THz imaging techniques.
  • The method is suitable for in-operando characterization of nanodevices.