Strong Cooperative Enhancement of Two-Photon Absorption in Dendrimers
The Journal of Physical Chemistry B2003Vol. 107(31), pp. 7540–7543
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Mikhail Drobizhev, Aliaksandr Karotki, Yuliya Dzenis, Aleksander Rebane, Zhiyong Suo, Charles W. Spangler
Abstract
We present, for the first time, unambiguous spectroscopic evidence of strong cooperative enhancement of two-photon absorption (TPA) in a series of dendritic macromolecules. The maximum TPA cross section increases in proportion to N2, where N = 2, 4, 6 is the number of constituent identical chromophore units. We show that the enhancement is facilitated by the quasi-planar structure, which allows direct interbranch conjugation throughout the molecule.
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