Berlin 2005 – wissenschaftliches Programm

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CPP: Chemische Physik und Polymerphysik

CPP 30: POSTER: Chemical physics

CPP 30.3: Poster

Dienstag, 8. März 2005, 16:30–18:30, Poster TU D

Quantum optical applications of single molecule spectroscopy with vibronic excitation — •Wolfgang Marquardt¹, Alper Kiraz², Özgur Müstecaplioğlu², Moritz Ehrl², Christoph Bräuchle¹, and Andreas Zumbusch¹ — ¹Department Chemie, Ludwig-Maximilians Universität München, Butenandtstr. 11, 81377 München, Germany — ²Department of Physics, Koç University, Rumelifeneri Yolu, 34450 Sariyer, Istanbul, Turkey

Low temperature single molecule spectroscopy often rely on excitation of the purely electronic zero-phonon-line (ZPL). Because the absorbing ZPL is so narrow, already small spectral jumps lead to a loss of the excitation. Here we report vibronic excitation combined with spectrally resolved ZPL detection as a novel technique for single molecule spectroscopy at cryogenic temperatures. In contrast to ZPL excitation, vibronic excitation benefits from broad absorption bands (broadened by 1-10 ps lifetimes and phonon sidebands) allowing the investigation of large spectral jumps [1]. We demonstrate that with our technique, also ultralong coherence times can be obtained by recording only the purely electronic zero-phonon line emission of single molecules. It will be shown that With single molecule emission of this type, quantum optical phenomena like two-photon interference can be observed [2]. Finally, our approach promises applications in spectroscopy of a wide-range of molecular systems including polymers and fluorescing proteins.

[1] A. Kiraz, M. Ehrl, C. Bräuchle, A. Zumbusch, J. Chem. Phys. 118, 10821 (2003) [2] A. Kiraz, M. Ehrl, C. Bräuchle, A. Zumbusch, Appl. Phys. Lett. 85, 920 (2004)