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HL: Fachverband Halbleiterphysik

HL 7: Poster I

HL 7.59: Poster

Monday, March 27, 2023, 13:00–15:00, P2/EG

Enhancing spatial resolution for terahertz waveform near-field microscopy — •Fabian Brütting, Moritz Heindl, and Georg Herink — Experimental Physics VIII, University of Bayreuth, Germany

The quantum confined Stark-effect induces field-driven modulations in the optical transitions of quantum emitters. Harnessing this ultrafast interaction in colloidal quantum dots enables us to image THz near-field waveforms with fluorescence microscopy in the visible spectrum [1]. The spatial resolution of fluorescence microscopy is principally not diffraction-limited and can be extended to the few-nanometer scale using super-resolution techniques such as stimulated emission depletion (STED) microscopy. The efficient depletion of quantum dot emission presents a key requirement [2]. In this contribution, we present our investigations on the STED process in the quantum dots employed as field-probes in the luminescence-based Quantum-probe field microscopy (QFIM) scheme.

[1] Heindl, M. B. et al., Ultrafast imaging of terahertz electric waveforms using quantum dots. Light Sci. Appl. 11, 5 (2022).

[2] Hanne, J. et al., STED nanoscopy with fluorescent quantum dots. Nat. Comm. 6, 7127 (2015).