SAMOP 2023 – scientific programme
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Q: Fachverband Quantenoptik und Photonik
Q 25: Solid State Quantum Optics
Q 25.5: Talk
Wednesday, March 8, 2023, 12:00–12:15, E001
Cavity-enhanced extinction measurements of nanoscale structures — •Ines Amersdorffer2,1, Florian Sigger3, Thomas Hümmer2,1, Jonathan Noé2,1, Alexander Högele1, Christoph Kastl3, and David Hunger4 — 1Faculty of Physics, Ludwig-Maximilians-Universität Munich, Germany — 2Qlibri GmbH, Munich, Germany — 3Walter Schottky Institute and Physics Department, Technical University of Munich, Germany — 4Physikalisches Institut, Karlsruhe Institute of Technology, Germany
Measurements of the marginal absorption of nanomaterials are challenging. One way to address this issue is the use of an optical resonator in which the light passes the sample multiple times and thereby enhances the absorption of nanoscale objects to a measurable amount. We demonstrate how a high-finesse microcavity can be utilised in order to measure the extinction of defects in monolayer MoS2. Such atomistic defects embedded in nanomaterials are a promising candidate for single-photon sources. However, to make them optically accessible, it is beneficial to know their absorption properties. To this end, we performed wavelength-dependent extinction measurements. The absolute values of extinction were recorded with a detection limit of down to 0.01 % and agree with theoretical predictions. Furthermore, we show first insights from applying this novel microscopy technique to perovskite nanocubes. Spectroscopy on single perovskite crystals helps to pick and engineer them for suitable applications, e.g. LEDs. The results show advances towards routine hyperspectral absorption measurements on the nanoscale.