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Absorption bleaching of squarylium dye J aggregates via a two-photon excitation process

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6 Author(s)
Furuki, Makoto ; Corporate Research Center, Fuji Xerox Company, Ltd., 430 Sakai, Nakaimachi, Kanagawa 259-0157, Japan ; Tian, Minquan ; Sato, Yasuhiro ; Pu, Lyong Sun
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Squarylium dye J aggregates exhibit ultrafast nonlinear optical response of absorption saturation at the resonant wavelength of 770 nm. We studied the two-photon excitation process of J aggregates. By fluorescence measurement, we found the two-photon absorption band at 1.3 μm, which was different from that of the dye solution at 1.2 μm. Absorption saturation at 770 nm via a two-photon excitation process was observed by two-photon resonant excitation at 1.3 μm and also by off-resonant excitation at 1.55 μm, suggesting the possibility of J aggregates for optical switching materials working at the wavelength used in optical communications. © 2001 American Institute of Physics.

Published in:

Applied Physics Letters  (Volume:79 ,  Issue: 6 )

Date of Publication:

Aug 2001

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