Hannover 2016 – wissenschaftliches Programm
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MO: Fachverband Molekülphysik
MO 11: Posters 2: Novelties in Molecular Physics: Femtosecond Spectroscopy, Quantum Control, Electronic Spectroscopy, Biomolecules and Photochemistry
MO 11.16: Poster
Dienstag, 1. März 2016, 16:30–19:00, Empore Lichthof
Design of an Experimental Setup for Optical Gating with Single Molecules — •Johannes Maier1, Tina Weller2, Mukundan Thelakkat2, Martti Pärs1, and Jürgen Köhler1 — 1Experimental Physics IV and Bayreuth Institute of Macromolecular Research (BIMF), University of Bayreuth, Germany — 2Applied Functional Polymers, University of Bayreuth, Germany
Photochromic molecules can be interconverted between two metastable states by light [1-3]. We synthesized a triad consisting of a photochromic unit (Dithienylperfluorocyclopentene, DCP) and two highly fluorescent chromophores (Perylene Bisimide, PBI) and monitored the PBI fluorescence intensity as a function of the state of the DCP. To ensure sufficiently long observation times for the study of individual triads we had to achieve both an enhanced photostability and an improvement of the light collection optics. The former was accomplished by performing the experiments at cryogenic temperatures, and for the latter we resorted to solid immersion lens (SIL) optics [4], which yielded an enhancement of the light collection efficiency by a factor of 1.8 with respect to the situation without the SIL. In first experiments we demonstrate distinctive changes of the fluorescence intensity emitted from individual triads triggered by changing the state of the DCP.
[1] Hirshberg: C. R. Hebd. Seances Acad. Sci. 1950, 231, 903 [2] Pärs, Hofmann, Willinger, Bauer, Thelakkat, Köhler: Angew. Chem. Int. Ed. 50 (2011), 11405 [3] Pärs, Gräf, Bauer, Thelakkat, Köhler: APL 103(2013), 221115 [4] Jasny, Sepiol, Irngartinger, Traber, Renn, Wild: Rev. Sci. Instrum. 67(1996), 1425