Regensburg 2022 – wissenschaftliches Programm

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HL: Fachverband Halbleiterphysik

HL 25: Poster 1

HL 25.23: Poster

Mittwoch, 7. September 2022, 18:00–20:00, P2

Ultra-sensitive extinction measurements of optically active defects in monolayer MoS₂ — •Ines Amersdorffer¹, Florian Sigger², Alexander Hötger², Manuel Nutz¹, Alexander Högele¹, David Hunger³, Thomas Hümmer¹, and Christoph Kastl² — ¹Faculty of physics, Ludwig-Maximilians-Universität Munich, Germany — ²Walter Schottky Institute and Physics Department, Technical University of Munich, Germany — ³Physikalisches 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. Here, we demonstrate how a high-finesse microcavity can be exploited in order to measure the extinction by 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 in the order of magnitude with theoretical predictions. In case of neglectable scattering, the extinction values can be interpreted as absorption. The results show advances towards routine hyperspectral absorption measurements on the nanoscale.