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Q: Fachverband Quantenoptik und Photonik
Q 64: Nano-Optics III
Q 64.8: Talk
Friday, March 18, 2022, 12:15–12:30, Q-H11
Ultrafast Field Microscopy of Terahertz Near-field Waveforms — •Moritz B. Heindl1, Nicholas Kirkwood2, Tobias Lauster3, Julia A. Lang1, Markus Retsch3, Paul Mulvaney2, and Georg Herink1 — 1Experimental Physics VIII, University of Bayreuth, Germany — 2ARC Centre of Excellence in Exciton Science, School of Chemistry, University of Melbourne, Australia — 3Physical Chemistry I, University of Bayreuth, Germany
Access to high-frequency electric waveforms is critical to the understanding of ultrafast plasmonic and field-driven nonlinear phenomena, yet, microscopic measurements still present a grand challenge. Here, we present a fluorescence-based field microscope for imaging ultrafast THz near-field evolutions using quantum dots. The Quantum-probe Field Microscopy (QFIM) scheme is enabled by the quantum-confined Stark-effect encoding the local field evolution in the luminescence yield of semiconductor nanocrystals [1,2]. QFIM allows for the spatio-temporal detection of THz sub-wavelength fields in the optical far-field using conventional fluorescence microscopy. We demonstrate the spatio-temporal tracking of propagating wavepackets confined to sub-wavelength THz waveguides, and we investigate the near-field evolutions inside single THz antennas with sub-cycle resolution [3]. QFIM paves a new route towards in-operando nanoscopy of nonlinear interactions and ultrafast nanodevices.
[1] Hoffmann, M. C. et al. Appl. Phys. Lett. 97, 231108 (2010).
[2] Pein, B. C. et al. Nano Lett. 17, 5375-5380 (2017).
[3] Heindl, M. B. et al. Light Sci. Appl. (in press).