Mega three-photon absorption cross-section enhancement in pseudoisocyanine J-aggregates |
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Authors: | Cohanoschi Ion Barbot Amel Belfield Kevin D Yao Sheng Hernandez Florencio E |
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Institution: | Department of Chemistry and College of Optics and Photonics, CREOL & FPCE, University of Central Florida, P. O. Box 162366, Orlando, Florida 32816-2366, USA. |
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Abstract: | Herein we report an extraordinary three-photon absorption cross-section (sigma'3) enhancement in J-aggregates supramolecular systems. The much higher value of sigma'3 in PIC J-aggregate (2.5 x 10(-71) cm6 s2 ph(-2)) compared to typical values obtained in organic molecules (10(-80) cm6 s2 ph(-2)) is attributed to the strong molecular transition dipole moment coupling in the supramolecular assembly. Three-photon absorption of PIC J-aggregates and monomer aqueous solutions were measured using the well known open aperture Z-scan technique pumping with a 25 ps pulse laser-OPG system at 1720 nm. This novel result opens new expectations for applications of supramolecular systems in bioimaging and medicine. |
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