Ultrafast resonant optical switching in isolated polyfluorenes chains

Tersilla Virgili, Daniele Marinotto, Guglielmo Lanzani, Donal D.C. Bradley

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68 Scopus citations


Using ultrafast spectroscopy, we report evidence of monodimensional photophysics coming from isolated chains of poly(9,9-dioctylfluorene) dispersed in a polymethylmethacrylate matrix. We identify intrachain charge carriers dynamics, the decay taking place in about 1 ps. Using a three-pulse experiment we bring evidence for charges generation from higher lying states and we report an ultrafast optical gain switching in the stimulated emission region over a broad wavelength range (around 100 nm). Our experiments suggest that the expected maximum rate of on-off switching in such a molecular device can be as high as 300 GHz. © 2005 American Institute of Physics.
Original languageEnglish (US)
JournalApplied Physics Letters
Issue number9
StatePublished - Feb 28 2005
Externally publishedYes

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