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Ultrafast imaging of terahertz electric waveforms using quantum dots

Title data

Heindl, Moritz ; Kirkwood, Nicholas ; Lauster, Tobias ; Lang, Julia ; Retsch, Markus ; Mulvaney, Paul ; Herink, Georg:
Ultrafast imaging of terahertz electric waveforms using quantum dots.
In: Light : Science and Applications. Vol. 11 (1 January 2022) . - No. 5.
ISSN 2047-7538
DOI: https://doi.org/10.1038/s41377-021-00693-5

Official URL: Volltext

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Open Access PublizierenNo information

Project financing: Deutsche Forschungsgemeinschaft

Abstract in another language

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 subwavelength
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 inoperando.

Further data

Item Type: Article in a journal
Refereed: Yes
Keywords: Nanophotonics and plasmonics; Quantum dots
Institutions of the University: Faculties > Faculty of Mathematics, Physics und Computer Science > Department of Physics > Juniorprofessor Experimental Physics VIII - Ultrafast Dynamics
Faculties > Faculty of Mathematics, Physics und Computer Science > Department of Physics > Juniorprofessor Experimental Physics VIII - Ultrafast Dynamics > Juniorprofessor Experimental Physics VIII - Ultrafast Dynamics - Juniorprof. Dr. Georg Herink
Faculties
Faculties > Faculty of Mathematics, Physics und Computer Science
Faculties > Faculty of Mathematics, Physics und Computer Science > Department of Physics
Result of work at the UBT: Yes
DDC Subjects: 500 Science > 530 Physics
Date Deposited: 14 Jan 2022 08:24
Last Modified: 14 Mar 2022 06:11
URI: https://eref.uni-bayreuth.de/id/eprint/68357