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Quantum-Probe Field Microscopy of Ultrafast Terahertz Excitations

Title data

Heindl, Moritz ; Kirkwood, Nicholas ; Lauster, Tobias ; Lang, Julia A. ; Retsch, Markus ; Mulvaney, Paul ; Herink, Georg:
Quantum-Probe Field Microscopy of Ultrafast Terahertz Excitations.
s.l. , 2021 . - 6 p.

Official URL: Volltext

Project information

Project title:
Project's official titleProject's id
No information403711541l

Project financing: Deutsche Forschungsgemeinschaft

Abstract in another language

Rapid evolutions of microscopic fields govern the majority of elementary excitations in condensed matter and drive microelectronic currents at increasing frequencies. Beyond nominal "radio frequencies", however, access to local electric waveforms remains a challenge. Several imaging schemes resolve sub-wavelength fields up to multi-Terahertz (THz) frequencies - including scanning-probe techniques, electro-optic sampling or recent ultrafast electron microscopy. Yet, various constraints on sample geometries, acquisition speed and maximum fields limit applications. Here, we introduce ubiquitous far-field microscopy of ultrafast local electric fields based on drop-cast quantum-dot probes. Our approach, termed Quantum-probe Field Microscopy (QFIM), combines fluorescence imaging of visible photons with phase-resolved sampling of electric fields deeply in the sub-wavelength regime. We capture stroboscopic movies of localized and propagating ultrafast Terahertz excitations with sub-picosecond temporal resolution. The scheme employs field-driven modulations of optical absorption in colloidal quantum-dots via the quantum-confined Stark-effect, accessible via far-field luminescence. The QFIM approach is compatible with strong-field sample excitation and sub-micrometer resolution - introducing a route towards ultrafast field imaging in active nanostructures during operation.

Further data

Item Type: Preprint, postprint
Institutions of the University: 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
Result of work at the UBT: Yes
DDC Subjects: 500 Science > 530 Physics
Date Deposited: 23 Apr 2021 10:03
Last Modified: 23 Apr 2021 10:03
URI: https://eref.uni-bayreuth.de/id/eprint/64837