Berlin 2024 – scientific programme
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O: Fachverband Oberflächenphysik
O 72: Poster: Scanning Probe Microscopy: Light Matter Interaction at Atomic Scales
O 72.2: Poster
Wednesday, March 20, 2024, 18:00–20:00, Poster D
Interactions between plasmons and excitons in single molecules — •Miguel Varea1,2, David Mateos1,2, Óscar Jover1,2, Koen Lauwaet1, Alberto Martín-Jimenez1, and Roberto Otero1,2 — 1IMDEA Nanoscience, Madrid, Spain — 2Dep. de Física de la Materia Condensada and Condensed Matter Physics Center (IFIMAC), Universidad Autónoma de Madrid
The interaction of localized plasmons and excitons in quantum emitters results in plexcitons, hybrid light-matter states, offering unique prospects for controlling single photon states. Scanning Tunneling Luminescence (STM-L) proves crucial in characterizing exciton-plasmon interactions, providing control over cavity dimensions and knowledge of molecular geometry. However, the incomplete comprehension of electron-tunneling luminescence processes hinders its full exploitation. Specifically, the optical behavior of metal-interfacing molecules lacks explanation when no insulation separates the molecule from the substrate. This study addresses this gap by studying changes in plasmonic modes within the cavity induced by organic molecules adsorbed on the metal surface. Despite a substantial drop in luminescence intensity due to the molecules, our analysis primarily links this decline to differences in the electronic structures of the molecules and the metal surface. By isolating the strictly optical effects of molecule presence, luminescence spectra become comparable, though not entirely identical. This contribution underscores the molecule-specific and aggregation-dependent nature of these modifications, paving the way for using STM-L to explore plasmon-exciton coupling at the nanoscale.
Keywords: Plasmonic nanocavity; Quantum emitters; Light-matter interaction; Scanning Tunneling Luminescence; Plexcitons