Journal
DYES AND PIGMENTS
Volume 57, Issue 1, Pages 43-54Publisher
ELSEVIER SCI LTD
DOI: 10.1016/S0143-7208(03)00003-2
Keywords
squaraine dyes; extended conjugation; J-aggregates; nonlinear optical properties; Z-scan measurements; optical switches
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This work describes the synthesis of new, highly soluble squaraine dyes, which have absorption maxima over 900 nm in solution. The absorption spectra of their spin-coated films show broad absorption bands, which are caused by aggregation phenomena. The absorption bands in the solid phase are red-shifted compared to those in solution. Because of these characteristics and nonlinear optical data which were obtained by Z-scan measurements, the new substances are principally useful for optical switches. (C) 2003 Elsevier Science Ltd. All rights reserved.
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