Dresden 2026 – scientific programme

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 17: Poster I

CPP 17.46: Poster

Monday, March 9, 2026, 19:00–21:00, P5

Measurement of photon antibunching of organic molecules by substrate scanning — •Janne Oskar Becker, Robert Schmidt, Steffen Michaelis de Vasconcellos, and Rudolf Bratschitsch — Institute of Physics, University of Münster

Single-molecule photoluminescence spectroscopy is often performed in solution, with molecules drifting in and out of a stationary focus. To immobilize single molecules, they are typically diluted in a solvent and spin-coated on a substrate. However, bleaching processes lead to decreasing photoluminescence count rates when illuminating isolated single-molecules over time, making photon antibunching measurements extremely challenging. To circumvent this, we measure multiple molecules sequentially by spatially scanning the spin-coated surface and accumulating photons of multiple single-molecules. In that way, we are able to measure photon antibunching Si/SiO₂ substrate.

Keywords: Laser gain medium; Single-molecule; Fluorescence