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Proceedings Paper

Cooperative enhancement of two- and three-photon absorption in dendrimers and their underlying coherent domain structure
Author(s): Mikhail Drobizhev; Aliaksandr Karotki; Yuliya Dzenis; Mikalai Kruk; Aleksander Rebane; Zhiyong Suo; Charles W. Spangler
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Paper Abstract

At present a special attention is concentrated on increasing of the efficiency of multi-photon absorption of organic systems because of new emerging applications based on this effect. In our experiments we use strong two-photon absorbing chromophore, 4,4’-bis(diphenylamino)stilbene (BDPAS), to design new dendrimer molecules, in such a way that the branching center allows for pi-electronic conjugation between branches. Here we present, for the first time, unambiguous spectroscopic evidence of strong cooperative enhancement of two-photon and three-photon absorption in a series of these dendritic macromolecules. Maximum two-photon cross section increases in proportion to N2, where N = 2, 4, 6 is the number of constituent identical chromophore units in the parent BDPAS and lowest, G-0 dendrimer generation. Almost the same scaling law is observed for three-photon absorption. For higher generations, G-1 and G-2, comprising N = 14 and 30 chromophores, respectively, the cooperativity in multiphoton response starts to saturate. We show that three-photon absorption provides important complementary information, which we use for evaluation of the size of domains where chromophores are coherently coupled.

Paper Details

Date Published: 3 November 2003
PDF: 10 pages
Proc. SPIE 5211, Nonlinear Optical Transmission and Multiphoton Processes in Organics, (3 November 2003); doi: 10.1117/12.505761
Show Author Affiliations
Mikhail Drobizhev, Montana State Univ. (United States)
P.N. Lebedev Physics Institute (United States)
Aliaksandr Karotki, Montana State Univ. (United States)
Yuliya Dzenis, Montana State Univ. (United States)
Mikalai Kruk, Montana State Univ. (United States)
Institute of Molecular and Atomic Physics (Belarus)
Aleksander Rebane, Montana State Univ. (United States)
Zhiyong Suo, Montana State Univ. (United States)
Charles W. Spangler, Montana State Univ. (United States)

Published in SPIE Proceedings Vol. 5211:
Nonlinear Optical Transmission and Multiphoton Processes in Organics
A. Todd Yeates; Kevin D. Belfield; Francois Kajzar; Christopher M. Lawson, Editor(s)

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