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 Kastl21Faculty 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.

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