Time-Resolved Absorption Spectroscopy of Polymethine J-Aggregates

Near‐Resonant Nonlinear OpticalProperties of Pseudoisocyanine J‐Aggregates in Langmuir‐BlodgettLayers

“…Compared to other thin layer techniques the Langmuir-Blodgett technique offers the unique possibility to align the structure on a molecular level. Special devices can be relatively easy designed by introducing molecules sensitive to a certain property into the layer structure, changing the molecular substituents which control the intermolecular distances, the angular distribution, the symmetry and other parameters important for optical nonlinearity [3,4]. Furthermore, recent progress in (LB) technology enables formation of twodimensional J-aggregate mono-and multilayers on glass substrates [1,4].…”

“…Special devices can be relatively easy designed by introducing molecules sensitive to a certain property into the layer structure, changing the molecular substituents which control the intermolecular distances, the angular distribution, the symmetry and other parameters important for optical nonlinearity [3,4]. Furthermore, recent progress in (LB) technology enables formation of twodimensional J-aggregate mono-and multilayers on glass substrates [1,4]. Such films possess spectral peculiarities close to those of selfaggregated polymethine dyes in aqueous solution and the nonlinear optical properties characteristic for molecular organic materials with highly delocalized r-electron system.…”

“…Such films possess spectral peculiarities close to those of selfaggregated polymethine dyes in aqueous solution and the nonlinear optical properties characteristic for molecular organic materials with highly delocalized r-electron system. Study of primary processes of photoexcited LB films of dye aggregates as well as investigation of nonlinear properties of LB mono-and multilayers is of great importance aiming to the understanding of the relationship between the optical nonlinearity, relaxation rates and mechanisms, structure and dimensionality of molecular assembly [5][6][7][8][9].…”