SAMOP 2023 – scientific programme
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QI: Fachverband Quanteninformation
QI 9: Photonic Quantum Technologies (joint session Q/QI)
QI 9.1: Talk
Tuesday, March 7, 2023, 11:00–11:15, A320
Fluorescence Excitation of Quantum Dots by Entangled Two-Photon Absorption — •Tobias B. Gäbler1,2, Patrick Hendra1,2, Nitish Jain1, Erik Prenzel1, and Markus Gräfe1,2,3 — 1Fraunhofer Institute of Applied Optics and Precision Engineering IOF, Albert-Einstein-Straße 7, D-07745 Jena, Germany — 2Friedrich-Schiller-Universität Jena, Abbe Center of Photonics, Max-Wien-Platz 1, D-07745 Jena, Germany — 3Technische Universität Darmstadt, Institute of Applied Physics, Hochschulstraße 6, D-64289 Darmstadt, Germany
Fluorescence excited by absorption of entangled light becomes a prominent candidate to tackle the challenges in the state-of-the-art two-photon imaging techniques, such as the requirement of bright excitation light and fast photobleaching. However, due to the low brightness of entangled photon pair sources used in most studies, fluorescence measurements were not feasible.
Our work addresses this issue by optimization of several experimental parts. Initially, a setup of an efficient entangled photon pair source based on nonlinear waveguides was assembled. Secondly, quantum dots were used to maximize the absorption cross sections and thus the probability to detect fluorescence photons. Additionally, we performed coherence measurements to observe influences of single-photon effects.
Our measurements of fluorescence demonstrate that obstacles like disruptive single-photon effects or insufficient photon pair rates can be handled. These results represent the next step towards an experimental realization of entangled light fluorescence microscopy.