Strong Enhancement of the Two Photon Absorption Cross Section of Porphyrin J-Aggregates in water
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Published:2004
Issue:
Volume:846
Page:
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ISSN:0272-9172
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Container-title:MRS Proceedings
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language:en
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Short-container-title:MRS Proc.
Author:
Collini Elisabetta,Ferrante Camilla,Bozio Renato
Abstract
ABSTRACTStrong 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.
Publisher
Springer Science and Business Media LLC
Subject
General Engineering
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2. 10. Pulse duration is measured through an autocorrelation experiment in a doubling BBO crystal.