1 November 1997 Ultrafast holography and transient-absorption spectroscopy in charge-transfer polymers
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Abstract
Charge-transfer polymers are a new class of nonlinear optical materials which can be used for generating femtosecond holographic gratings. Using semiconducting polymers sensitizes with varying concentrations of C60, holographic gratings were recorded by individual ultrafast laser pulses; the diffraction efficiency and time decay of the gratings were measured using non-degenerate four-wave mixing. Using a figure of merit for dynamic data processing, the temporal diffraction efficiency, this new class of materials exhibits between two and 12 orders of magnitude higher response than previous reports. The charge transfer range at polymer/C60 interfaces was further studied using transient absorption spectroscopy. The fact that charge-transfer occurs in the picosecond-time scale in bilayer structures implies that diffusion of localized excitations to the interface is not the dominant mechanism; the charge transfer range to be 80 angstrom and interpret that range as resulting from quantum delocalization of the photoexcitations.
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Duncan W. McBranch, Duncan W. McBranch, Eric S. Maniloff, Eric S. Maniloff, Dan Vacar, Dan Vacar, Alan J. Heeger, Alan J. Heeger, } "Ultrafast holography and transient-absorption spectroscopy in charge-transfer polymers", Proc. SPIE 3142, Fullerenes and Photonics IV, (1 November 1997); doi: 10.1117/12.293357; https://doi.org/10.1117/12.293357
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