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18 August 2005 Coherent domain structure in linear and dendrimer chromophores studied by one- and three-photon absorption spectroscopy
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Abstract
In this paper we measure three-photon absorption spectra and cross sections of two new series of molecules, linear bis-difluorenylamine-substituted oligofluorenylene-vinylenes (N-Fl3 series) and triphenylamine-branched phenylacetylene dendrimers (N-PA3 series). Using our model described before, we evaluate the size of coherent domains in these two series and compare them to those in dendrimers with nitrogen branching center and stilbene branches. This allows us to draw the conclusions about the effect of dimensionality (linear oligomers versus dendrimers), topology of the dendrimer core (3-arm versus 4-arm core), and branch structure on the size of coherent domains, and, hence the strength of cooperative enhancement of multiphoton absorption in macromolecules.
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M. Drobizhev, N. Christensson, A. Rebane, Z. Suo, C. W. Spangler, O. Mongin, and M. Blanchard-Desce "Coherent domain structure in linear and dendrimer chromophores studied by one- and three-photon absorption spectroscopy", Proc. SPIE 5934, Nonlinear Optical Transmission and Multiphoton Processes in Organics III, 59340H (18 August 2005); https://doi.org/10.1117/12.617513
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