Journal
SYNTHETIC METALS
Volume 139, Issue 3, Pages 795-797Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/S0379-6779(03)00281-9
Keywords
multiphoton absorption spectroscopy; heterocycle synthesis; laser spectroscopy; non-linear optical methods
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We report the first example of a heterocycle-based multi-branched two-photon absorption (TPA) dye. We show that the new chromophore presents a very large TPA cross-section in the femtoseconds (fs) regime. Comparison of the TPA cross-sections between the branched system and the corresponding monomeric unit shows a strong cooperative enhancement. A value of 22.6:1, corresponding to a 750% enhancement, was observed. (C) 2003 Elsevier Science B.V. All rights reserved.
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