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Proceedings Paper

Design, synthesis, and characterization of new organic dendrimers with greatly enhanced two-photon absorption
Author(s): Charles W. Spangler; Zhiyong Suo; Mikhail A. Drobizhev; Aliaksandr Karotki; Aleksander Rebane
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Paper Abstract

Dendrimers have unique highly branched repeating structures that display intriguing processing and photonic properties. We have recently synthesized several generations of a new dendrimer series based on bis-(diphenylamino)-E-stilbene repeat units which have proven to be highly processible in common organic solvents, and which can be designed and synthesized in either three-arm or four-arm structural motifs. We have measured the dependence of the two-photon absorption (TPA) on excitation wavelength for the G-0, G-1 and G-2 generations of these monodisperse macromolecules, and have shown that the maximum value for the intrinsic TPA cross-section for femtosecond pulses inceases in proportion to the total number of stilbene chromophores, and yields a record high cross-sectrion for the G-2 dendrimer (11,000 GM units). We have now been able to incorporate a variety of electron donor and acceptor substituents in the three-arm dendrimer G-0 system to establish structure-property relatiuonships for the further enhancement of the intrinsic two-photon cross-sections. We have found a dramatic enhancement of the two-photon cross-sections for these dendrimers compared to the parent bis-(diphenylamino)-E-stilbene (BDPAS). In the 3-arm G-0 series, the intrinsic TPA cross-section, measured at the TPA maximum, varies from 1,400 to 1,900 GM units compared to 130 GM units for BDPAS, a more than 10-fold enhancement, while the number of BDPAS repeat units in the G-0 dendrimer is only 3 times the parent BDPAS structure.

Paper Details

Date Published: 14 February 2003
PDF: 6 pages
Proc. SPIE 4797, Multiphoton Absorption and Nonlinear Transmission Processes: Materials, Theory, and Applications, (14 February 2003); doi: 10.1117/12.453318
Show Author Affiliations
Charles W. Spangler, Montana State Univ. (United States)
Zhiyong Suo, Montana State Univ. (United States)
Mikhail A. Drobizhev, Montana State Univ. (United States)
Aliaksandr Karotki, Montana State Univ. (United States)
Aleksander Rebane, Montana State Univ. (United States)

Published in SPIE Proceedings Vol. 4797:
Multiphoton Absorption and Nonlinear Transmission Processes: Materials, Theory, and Applications
A. Todd Yeates; Christopher M. Lawson; Kevin D. Belfield; Stephen J. Caracci; Francois Kajzar; A. Todd Yeates; Kevin D. Belfield; Stephen J. Caracci, Editor(s)

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