Freiburg 2024 – wissenschaftliches Programm

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Q: Fachverband Quantenoptik und Photonik

Q 71: Nano-Optics

Q 71.7: Vortrag

Freitag, 15. März 2024, 16:00–16:15, HS 3219

Fourier-limited Single Molecules on a Surface — •Masoud Mirzaei^{1, 2}, Alexey Shkarin¹, Johannes Zirkelbach¹, Ashley Jiwon Shin¹, Jan Renger¹, Tobias Utikal¹, Stephan Götzinger^{1, 2, 3}, and Vahid Sandoghdar^{1 ,2} — ¹Max Planck Institute for the Science of Light, 91058 Erlangen, Germany — ²Department of Physics, Friedrich-Alexander University Erlangen-Nürnberg, 91058 Erlangen, Germany — ³Erlangen Graduate School in Advanced Optical Technologies (SAOT), Friedrich-Alexander University Erlangen-Nürnberg, 91052 Erlangen, Germany

We investigate the spectroscopic properties of individual dibenzoterrylene (DBT) molecules on pristine anthracene crystal surfaces at sub-Kelvin temperatures. By quantifying temperature-induced dephasing effects on the molecular transitions, we show that dephasing becomes negligible below 2K, leading to Fourier-limited zero-phonon lines in DBT. We report on the spectral stability of single molecule transitions as a function of laser power. Furthermore, polarization sensitive measurements allow us to determine the transition dipole orientation, which in turn provides direct information about the preferred orientation of DBT molecules on anthracene crystal surfaces, in agreement with theoretical predictions. Our work marks the first instance of a lifetime-limited emission for molecules placed on naked surfaces, opening the door to investigations in the deep optical near-field regime, where atomic-resolution microscopy can be combined with high-resolution molecular spectroscopy.

Keywords: Fourier-limited zero-phonon lines; Single molecules on crystal surfaces; High-resolution molecular spectroscopy; Dibenzoterrylene (DBT) molecules; Anthracene crystal