title: Mega three-photon absorption cross-section enhancement in pseudoisocyanine J-aggregates.
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.
authors.affiliation: Department of Chemistry and College of Optics and Photonics, CREOL & FPCE, University of Central Florida, P. O. Box 162366, Orlando, Florida 32816-2366, USA.
authors.forename: Ion
authors.initials: I
authors.lastname: Cohanoschi
authors.forename: Amel
authors.initials: A
authors.lastname: Barbot
authors.forename: Kevin D
authors.initials: KD
authors.lastname: Belfield
authors.forename: Sheng
authors.initials: S
authors.lastname: Yao
authors.forename: Florencio E
authors.initials: FE
authors.lastname: Hernandez
mesh_terms: D000042:Absorption; D002627:Chemistry, Physical / Q000379:methods*; D008956:Models, Chemical; D008962:Models, Theoretical; D008968:Molecular Conformation; D015394:Molecular Structure; D010777:Photochemistry / Q000379:methods*; D017785:Photons; D011804:Quinolines / Q000737:chemistry*; D013056:Spectrophotometry, Ultraviolet; D019265:Spectroscopy, Near-Infrared
chemical_list: D011804:Quinolines; C100254:pseudoisocyanine