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.
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The authors thank Mr. Gabriele Marcolongo for its technical help. This work was supported by FIRB2001 grant from MIUR (n. RBNE01P4JF) and by the University of Padova.
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Collini, E., Ferrante, C. & Bozio, R. Strong Enhancement of the Two Photon Absorption Cross Section of Porphyrin J-Aggregates in water. MRS Online Proceedings Library 846, 27 (2004). https://doi.org/10.1557/PROC-846-DD2.7