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Proceedings Paper

Anisotropy of third-order nonlinear optical responses in metallophthalocyanine aggregates
Author(s): Takashi Isoshima; Hideyuki Watanabe; Koji Ishizaki; Tatsuo Wada; Hiroyuki Sasabe
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Paper Abstract

Anisotropy of transient absorption change and electroabsorption response in metallophthalocyanine (MPc) aggregates were investigated in terms of the influence of intermolecular interaction to the 2D character of the molecule. In an MPc aggregate intermolecular interaction with less symmetry might result in appearance of 1D character, depending on the nature of interaction and arrangement of molecules. In experiment, polarization- dependent electroabsorption response in various MPcs doped in PMMA presented a 1D character at the red-shifted absorption band due to coplanar intermolecular interaction and a 2D one at the blue-shifted band due to cofacial interaction. Polarization-dependent subpicosecond transient absorption change in various aggregate vanadylphthalocyanine, evaporated and doped-polymer films in phase-I and phase-II aggregation, presented a variety of anisotropy: in phase-I aggregate doped in polystyrene, a wavelength-dependent anisotropy similar to that of electroabsorption response was obtained; in phase-I aggregates doped in PMMA or evaporated, a 2D character was observed in almost whole wavelength region; in phase-II aggregates both 1D and 2D characters were in the red-shifted absorption band. These result are partly elucidated by the exciton coupling model in 2D molecules. It is also suggested that pump wavelength dependence of anisotropy and existence of two or more aggregate species might play important rolls.

Paper Details

Date Published: 11 October 1999
PDF: 12 pages
Proc. SPIE 3796, Organic Nonlinear Optical Materials, (11 October 1999); doi: 10.1117/12.368300
Show Author Affiliations
Takashi Isoshima, RIKEN-The Institute of Physical and Chemical Research and Japan Science and Technology Co (Japan)
Hideyuki Watanabe, Keio Univ. (Japan)
Koji Ishizaki, Chuo Univ. (Japan)
Tatsuo Wada, RIKEN-The Institute of Physical and Chemical Research and Japan Science and Technology Co (Japan)
Hiroyuki Sasabe, RIKEN, Japan Science and Technology Corp., and Chitose Institute of Science and Technology (Japan)

Published in SPIE Proceedings Vol. 3796:
Organic Nonlinear Optical Materials
Manfred Eich; Manfred Eich; Mark G. Kuzyk, Editor(s)

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