Herein we report an extraordinary three-photon absorption cross-section (σ3′) enhancement in J-aggregates supramolecular systems. The much higher value of σ3′ in PIC J-aggregate (2.5× 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.
All Science Journal Classification (ASJC) codes
- General Physics and Astronomy
- Physical and Theoretical Chemistry