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Femtosecond Optical Nonlinearity in the Squarylium Dye J-Aggregates

Published online by Cambridge University Press:  10 February 2011

M. Furuki ,
L. S. Pu ,
F. Sasaki ,
S. Kobayashi  and
T. Tani
M. Furuki
Affiliation:
FESTA Laboratories, 5-5 Tokodai, Tsukuba, Ibaraki 300-26, Japan, furuki@festa.or.jp
L. S. Pu
Affiliation:
Foundation Res. Lab., Fuji Xerox Co. Ltd., 430 Sakai, Nakaimachi, Kanagawa 259-01, Japan
F. Sasaki
Affiliation:
Electrotechnical Laboratory, 1-1-4 Umezono, Tsukuba, Ibaraki 305, Japan
S. Kobayashi
Affiliation:
Electrotechnical Laboratory, 1-1-4 Umezono, Tsukuba, Ibaraki 305, Japan
T. Tani
Affiliation:
Electrotechnical Laboratory, 1-1-4 Umezono, Tsukuba, Ibaraki 305, Japan
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Abstract

Squarylium dye with two propyl and two hexyl groups forms a mono-molecular layer with domains of J-aggregates by spreading its chloroform solution at an air-water interface. Fluorescence microscopy and an absorbance evaluation which also considers the reflectance suggest that this Langmuir-film has a close packed two-dimensional structure with a complete Jaggregate formation of all dye molecules. Strong and ultrafast nonlinear optical responses, indicating delocalization of excitons over 30 molecules, have been observed at 5 °C from this ideal mono-molecular layer of J-aggregates.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 488: Symposium J – Electrical, Optical & Magnetic Properties of Organic IV , 1997 , 777
Copyright
Copyright © Materials Research Society 1998

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