Dresden 2026 – scientific programme
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O: Fachverband Oberflächenphysik
O 43: Scanning probe microscopy: light matter interaction at atomic scales – Poster
O 43.17: Poster
Tuesday, March 10, 2026, 14:00–16:00, P2
Utilizing a Tunable Laser for Tip Enhanced Photoluminescence of Single Molecules — •Maximilian Rödel1, Rodrigo Cezar De Campos Ferreira1, Jiři Doležal1, and Martin Švec1,2 — 1Institute of Organic Chemistry and Biochemistry (IOCB), Czech Academy of Sciences, Flemingovo náměstí 542/2. CZ16000, Praha 6, Czech Republic — 2Institute of Physics, Czech Academy of Sciences, Cukrovarnická 10/112, CZ16200, Praha 6, Czech Republic
The study of organic molecules and their optical properties provides insight into molecular interactions, guiding the design of materials for advanced opto-electronic devices. In this contribution, we present a tip-enhanced photoluminescence (TEPL) scanning tunneling microscope (STM) setup by utilizing a tunable Ti:Sapphire laser not only for resonant excitation of organic molecules like MgPc, but, moreover, for disentangling optical signals.
For this purpose, a parabolic mirror is used for coupling the laser into the nano-cavity, ensuring wavelength-independent imaging and minimizing aberrations, enabling a consistent performance across the entire visible wavelength range. By doing so, high-resolution spectra of single-molecule MgPc at temperatures of <7 K on a Ag111/NaCl surface can be detected and by changing the excitation wavelength the vibronic contribution and the Raman signal can be distinguished.
With this model system, we are able to complement our optical data set and even hope to establish photoluminescence excitation spectroscopy for future measurements.
Keywords: Plasmonic Nanocavity; Light-Matter Interaction; Organic Semiconductors; STM