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Q: Fachverband Quantenoptik und Photonik
Q 23: Nano-Optics (Single Quantum Emitters) I
Q 23.6: Vortrag
Mittwoch, 11. März 2020, 12:30–12:45, a310
Highly enhanced photostability of single molecules in vacuum — •Randhir Kumar1, Hsuan-Wei Liu1, Stephan Götzinger2,1, and Vahid Sandoghdar1,2 — 1Max Planck Institute for the Science of Light, Erlangen, Germany — 2Friedrich Alexander University of Erlangen-Nürnberg, Erlangen, Germany
Single dye molecules present an excellent source of single photons with high brightness and flexibility of wavelengths. To protect them against photobleaching, one needs to shield them from the surrounding reactive agents, e.g. by embedding them in special thin films [1]. However, the finite thickness of such a medium also prevents the molecules from being placed in very small gaps necessary for very large plasmonic enhancements [2] and high spontaneous emission rate enhancement [3]. We, therefore, investigate the use of bare single dye molecules on a glass substrate. To prevent photobleaching under ambient conditions, we place the molecules in a home-built vacuum microscope that operates with a high numerical aperture at 1e-6 mbar pressure. We report on more than one order of magnitude enhancement in photostability in vacuum compared to the ambient conditions and present some prospects for exploiting our findings.
[1] Chu, Götzinger, Sandoghdar, Nature Photonics 11, 58 (2017). [2] Chikkaraddy et al., Nature 535, 127-130 (2016). [3] Matsuzaki et al., Sci. Rep. 7, 42307 (2017).