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Langmuir-Blodgett Films of Squarylium Dye J-Aggregates Exhibiting Femtosecond Optical Responses

Published online by Cambridge University Press:  10 February 2011

M. Furuki ,
H. Kawashima ,
T. Tani  and
L. S. Pu
M. Furuki
Affiliation:
The FESTA Laboratories, 5-5 Tokodai, Tsukuba, Ibaraki 300-26, Japan, [email protected]
H. Kawashima
Affiliation:
Electrotechnical Laboratory, 1-1-4 Umezono, Tsukuba, Ibaraki 305, Japan
T. Tani
Affiliation:
Corporate Res. Labs., Fuji Xerox Co. Ltd., 430 Sakai, Nakaimachi, Kanagawa 259-01, Japan
L. S. Pu
Affiliation:
Corporate Res. Labs., Fuji Xerox Co. Ltd., 430 Sakai, Nakaimachi, Kanagawa 259-01, Japan
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Abstract

J-aggregates of squarylium dyes in Langmuir films have been found to exhibit highly efficient and ultrafast nonlinear optical properties. We established a novel method for making Langmuir- Blodgett (LB) films of J-aggregates with a single absorption band at 784 nm. Deposition of the LB-films was carried out under excess compression of the Langmuir films at a constant speed. Coating the surface of the LB-film with a glassy poly-perfluorocarbon was found to enhance and stabilize the formation of J-aggregates. Characterization of morphology using a near-field scanning optical microscope (NSOM) showed that this LB-film has a highly ordered structure comprising 2- dimensional domains of J-aggregates. We also observed nonlinear-optical responses from this LBfilm. Ultrafast decay of absorption change (250 fs) with quite low saturation energy (3.4 μJ/cm2•pulse) was observed in femtosecond pump-probe measurements. These results suggest highly delocalization of excited states in the J-aggregates of this LB-film with the 2-dimensional mono-molecular layer structure which initially formed in the Langmuir film.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 561: Symposium F – Organic Nonlinear Optical Materials and Devices , 1999 , 9
Copyright
Copyright © Materials Research Society 1999

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References

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