Published in
Elsevier, Synthetic Metals, 3(139), p. 795-797
DOI: 10.1016/s0379-6779(03)00281-9
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Design and synthesis of heterocyclic multi-branched dyes for two-photon absorption
Journal article published in 2003 by
A. Abbotto 
,
L. Beverina,
S. Bradamante,
A. Facchetti,
G. A. Pagani,
R. Bozio ,
C. Ferrante,
D. Pedron,
R. Signorini
,
L. Beverina,
S. Bradamante,
A. Facchetti,
G. A. Pagani,
R. Bozio ,
C. Ferrante,
D. Pedron,
R. Signorini
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Abstract
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.