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Proceedings Paper

Development of novel two-photon absorbing chromophores
Author(s): Joy E. Rogers; Jonathan E. Slagle; Daniel G. McLean; Richard L. Sutherland; Douglas M. Krein; Thomas M. Cooper; Mark Brant; James Heinrichs; Ramamurthi Kannan; Loon-Seng Tan; Augustine M. Urbas; Paul A. Fleitz
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Paper Abstract

There has been much interest in the development of two-photon absorbing materials and many efforts to understand the nonlinear absorption properties of these dyes but this area is still not well understood. A computational model has been developed in our lab to understand the nanosecond nonlinear absorption properties that incorporate all of the measured one-photon photophysical parameters of a class of materials called AFX. We have investigated the nonlinear and photophysical properties of the AFX chromophores including the two-photon absorption cross-section, the excited state cross-section, the intersystem crossing quantum yield, and the singlet and triplet excited state lifetimes using a variety of experimental techniques that include UV-visible, fluorescence and phosphorescence spectroscopy, time correlated single photon counting, ultrafast transient absorption, and nanosecond laser flash photolysis. The model accurately predicts the nanosecond nonlinear transmittance data using experimentally measured parameters. Much of the strong nonlinear absorption has been shown to be due to excited state absorption from both the singlet and triplet excited states. Based on this understanding of the nonlinear absorption and the importance of singlet and triplet excited states we have begun to develop new two-photon absorbing molecules within the AFX class as well as linked to other classes of nonlinear absorbing molecules. This opens up the possibilities of new materials with unique and interesting properties. Specifically we have been working on a new class of two-photon absorbing molecules linked to platinum poly-ynes. In the platinum poly-yne chromophores the photophysics are more complicated and we have just started to understand what drives both the linear and non-linear photophysical properties.

Paper Details

Date Published: 14 September 2006
PDF: 12 pages
Proc. SPIE 6330, Nonlinear Optical Transmission and Multiphoton Processes in Organics IV, 633002 (14 September 2006); doi: 10.1117/12.682984
Show Author Affiliations
Joy E. Rogers, Air Force Research Lab. (United States)
UES, Inc. (United States)
Jonathan E. Slagle, Air Force Research Lab. (United States)
AT&T Government Solutions (United States)
Daniel G. McLean, Air Force Research Lab. (United States)
Science Applications International Corp. (United States)
Richard L. Sutherland, Air Force Research Lab. (United States)
Science Applications International Corp. (United States)
Douglas M. Krein, Air Force Research Lab. (United States)
Anteon Corp. (United States)
Thomas M. Cooper, Air Force Research Lab. (United States)
Mark Brant, Air Force Research Lab. (United States)
Science Applications International Corp. (United States)
James Heinrichs, Air Force Research Lab. (United States)
Ramamurthi Kannan, Air Force Research Lab. (United States)
SYNCON (United States)
Loon-Seng Tan, Air Force Research Lab. (United States)
Augustine M. Urbas, Air Force Research Lab. (United States)
Paul A. Fleitz, Air Force Research Lab. (United States)


Published in SPIE Proceedings Vol. 6330:
Nonlinear Optical Transmission and Multiphoton Processes in Organics IV
A. Todd Yeates; Kevin D. Belfield; Francois Kajzar, Editor(s)

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