Regensburg 2025 – wissenschaftliches Programm
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HL: Fachverband Halbleiterphysik
HL 39: Poster III
HL 39.9: Poster
Mittwoch, 19. März 2025, 15:00–18:00, P3
Ultra-sensitive absorption measurements of perovskites nanocrystals, protein crystals and photo-switchable lipids — •Ayesha Khan1, Simone Strohmair1, Ines Amersdorffer1,2, David Hunger3, and Thomas Hümmer1,2 — 1Qlibri GmbH, Munich, Germany — 2Ludwig Maximilian University of Munich, Munich, Germany — 3Karlsruhe Institute of Technology, Karlsruhe, Germany
Optical studies of nano-scale systems through spectroscopy and imaging can reveal intrinsic optical properties of materials including resolving the exitonic fine structure of systems. However, due to diminutive absorption of nano-scale systems, it is challenging to perform absorption spectroscopy. For a nano-scale system placed inside an optical resonator, the light passes through the sample thousands of times, enhancing the absorption and thus, allowing measurements.
Here we present the use of a fiber-based, open-access micro-cavity to image and obtain hyperspectral maps of absorption for different nano-scale, solid state materials including perovskites nanocrystals, protein crystals and photo-switchable lipids.
The successful measurements of different nano-scale systems promise that fiber-based microcavities can become standard tools for absorption measurements of these systems.
Keywords: absorption; micro-cavities; spectroscopy; nanocrystals; hyperspectral maps