Ultrafast imaging of terahertz electric waveforms using quantum dots

Moritz B. Heindl; Nicholas Kirkwood; Tobias Lauster; Julia A. Lang; Markus Retsch; Paul Mulvaney; Georg Herink

doi:10.1038/s41377-021-00693-5

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Ultrafast imaging of terahertz electric waveforms using quantum dots

Articles

- Ultrafast imaging of terahertz electric waveforms using quantum dots
- Light: Science & Applications Vol. 11, Issue 1, Pages: 63-68(2022)
- Affiliations：
  
  1.Experimental Physics Ⅷ – Ultrafast Dynamics, University of Bayreuth, Bayreuth, Germany
  2.ARC Centre of Excellence in Exciton Science, School of Chemistry, University of Melbourne, Melbourne, Australia
  3.Physical Chemistry I, University of Bayreuth, Bayreuth, Germany
- Author bio：
  
  Georg Herink (georg.herink@uni-bayreuth.de)
- Funds：
- DOI：10.1038/s41377-021-00693-5
  CLC：
- Published：31 January 2022，
  
  Published Online：01 January 2022，
  
  Received：23 September 2021，
  
  Revised：26 November 2021，
  
  Accepted：01 December 2021
- Accepted：
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Heindl, M. B. et al. Ultrafast imaging of terahertz electric waveforms using quantum dots. Light: Science & Applications, 11, 63-68 (2022).
DOI：

Heindl, M. B. et al. Ultrafast imaging of terahertz electric waveforms using quantum dots. Light: Science & Applications, 11, 63-68 (2022). DOI： 10.1038/s41377-021-00693-5.

摘要

Abstract

Microscopic electric fields govern the majority of elementary excitations in condensed matter and drive electronics at frequencies approaching the Terahertz (THz) regime. However

only few imaging schemes are able to resolve sub-wavelength fields in the THz range

such as scanning-probe techniques

electro-optic sampling

and ultrafast electron microscopy. Still

intrinsic constraints on sample geometry

acquisition speed and field strength limit their applicability. Here

we harness the quantum-confined Stark-effect to encode ultrafast electric near-fields into colloidal quantum dot luminescence. Our approach

termed Quantum-probe Field Microscopy (QFIM)

combines far-field imaging of visible photons with phase-resolved sampling of electric waveforms. By capturing ultrafast movies

we spatio-temporally resolve a Terahertz resonance inside a bowtie antenna and unveil the propagation of a Terahertz waveguide excitation deeply in the sub-wavelength regime. The demonstrated QFIM approach is compatible with strong-field excitation and sub-micrometer resolution—introducing a direct route towards ultrafast field imaging of complex nanodevices in-operando.

关键词

Keywords

references

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