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Phys. Rev. B 75, 195216 (2007) [5 pages]

Simultaneous ultrafast probing of intramolecular vibrations and photoinduced charge carriers in rubrene using broadband time-domain THz spectroscopy

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Mattijs Koeberg1,2, Euan Hendry3, Juleon M. Schins4, Hendrik A. van Laarhoven5, Cees F. J. Flipse5, Klaus Reimann6, Michael Woerner6, Thomas Elsaesser6, and Mischa Bonn1,2
1FOM Institute for Atomic and Molecular Physics, Kruislaan 407, 1098 SJ Amsterdam, The Netherlands
2Leiden Institute of Chemistry, Leiden University, Einsteinweg 55, P.O. Box 9502, 2300 RA Leiden, The Netherlands
3Electromagnetic Materials Group, School of Physics, University of Exeter, Stocker Road, Exeter EX4 4QL, United Kingdom
4Opto-Electronic Materials Section, DelftChemTech, Delft University of Technology, Mekelweg 15, 2629 JB Delft, The Netherlands
5Chemical Engineering and Chemistry, Eindhoven University of Technology, 5600 MB Eindhoven, The Netherlands
6Max-Born-Institut für Nichtlineare Optik und Kurzzeitspektroskopie, Max-Born-Strasse 2A, 12489 Berlin, Germany

Received 22 January 2007; revised 15 March 2007; published 29 May 2007

We determine the ultrafast frequency- and time-resolved complex dielectric responses of photoexcited, single-crystal rubrene in the frequency range of 10–30 THz (330–1000 cm−1) using ultrafast broadband THz spectroscopy. In this frequency range, we observe the response of both photogenerated mobile charges and intramolecular vibrational modes simultaneously, both of which vary with time after excitation. The data in conjunction with a theoretical model indicate a dynamic blueshift of the 15.5 THz phonon.

© 2007 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevB.75.195216
DOI:
10.1103/PhysRevB.75.195216
PACS:
72.80.Le, 63.20.Kr, 72.20.−i, 71.38.−k
 
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