Regensburg 2022 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 78: Plasmonics and Nanooptics 3
O 78.4: Vortrag
Freitag, 9. September 2022, 11:15–11:30, H3
Spatially-resolved THz near-field spectroscopy — •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
Spectroscopic access to ultrafast electric waveforms is critical to the understanding of 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 employing the quantum-confined Stark-effect in semiconductor quantum dots [1,2]. This Quantum-Probe Field Microscopy (QFIM) scheme [3] allows for detection of strongly confined near-fields in three-dimensional structures. Using QFIM, we demonstrate spatially-resolved near-field spectroscopy of single THz resonators and propagating THz excitations inside wave-guiding structures.
[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. 11, 5 (2022)