TITLE

Time-resolved waveguide modulation of a conjugated polymer

AUTHOR(S)
Sinclair, M.; McBranch, D.; Moses, D.; Heeger, A. J.
PUB. DATE
December 1988
SOURCE
Applied Physics Letters;12/12/1988, Vol. 53 Issue 24, p2374
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
We present a new pump and probe technique for measuring intensity-dependent refractive indices (n2) of waveguide quality thin films, and we apply it to films of polydiacetylene-(CH2)4OCONHOCOC4H9 (PDA-4BCMU). Just below the exciton absorption band, the real part of n2 is negative with magnitude ≊10-7(MW/cm2)-1. The initial fast response of n2 is followed by a slower (∼2.5 ps) decay, in close agreement with the decay of the bleaching of the exciton absorption following resonant excitation. These results are consistent with phase space filling by excitons as the mechanism for the nonlinear index.
ACCESSION #
9829183

 

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