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Strong Enhancement of the Two Photon Absorption Cross Section of Porphyrin J-Aggregates in water

Published online by Cambridge University Press:  01 February 2011

Elisabetta Collini ,
Camilla Ferrante  and
Renato Bozio
Elisabetta Collini
Affiliation:
Chemistry Department, University of Padova Via Marzolo 1, I-35131 Padova, Italy, Consorzio INSTM, Via Benedetto Varchi 59, I-50132 Firenze, Italy
Camilla Ferrante
Affiliation:
Chemistry Department, University of Padova Via Marzolo 1, I-35131 Padova, Italy, Consorzio INSTM, Via Benedetto Varchi 59, I-50132 Firenze, Italy
Renato Bozio
Affiliation:
Chemistry Department, University of Padova Via Marzolo 1, I-35131 Padova, Italy, Consorzio INSTM, Via Benedetto Varchi 59, I-50132 Firenze, Italy
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Abstract

Strong enhancement of the two photon absorption (TPA) cross section at 812 nm is observed for tetrakis(4-sulphonatophenyl)porphyrin diacid (H4TPPS2-) when a J-type aggregate is formed in water, in comparison to the one observed for the H4TPPS2- monomer in mixture of water, DMSO and urea. Open aperture Z-scan experiments, performed with ultra-short laser pulses, are employed to measure the TPA absorption cross section. The observed enhancement is discussed in terms of possible electronic cooperative effects in the aggregate.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 846: Symposium DD – Organic and Nanocomposite Optical Materials , 2004 , DD2.7
Copyright
Copyright © Materials Research Society 2005

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