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Wavelength and intensity-dependent transient degenerate four-wave mixing in pseudoisocyanine J-aggregates

hal.structure.identifierVilnius University [Vilnius]
dc.contributor.authorGADONAS, R.
hal.structure.identifierJena University Hospital [Jena]
dc.contributor.authorFELLER, K. H.
hal.structure.identifierVilnius University [Vilnius]
dc.contributor.authorPUGZLYS, A.
hal.structure.identifierCentre de physique moléculaire optique et hertzienne [CPMOH]
dc.contributor.authorJONUSAUSKAS, Gediminas
hal.structure.identifierCentre de physique moléculaire optique et hertzienne [CPMOH]
dc.contributor.authorOBERLE, J.
hal.structure.identifierCentre de physique moléculaire optique et hertzienne [CPMOH]
dc.contributor.authorRULLIERE, C.
dc.date.issued1997-05-22
dc.identifier.issn0021-9606
dc.description.abstractEnThe results of transient degenerate four-wave mixing ~DFWM! and ‘‘pump-probe’’ spectroscopy in aggregates of 1,18-diethyl-2,28-cyanine ~pseudoisocyanine, PIC! chloride at 300 K are reported. Spectral dispersion of DFWM efficiency within the J-band and near exciton resonance has been measured. Time response of both transient absorption changes and DFWM signal is found to be strongly dependent on pump photon fluence and wavelength. This behavior is qualitatively explained within a physical model of nonlinear optical dynamics in aggregate domains which accounts for exciton annihilation, and the effect of nonthermal phonons produced as a result of decay of two-exciton states. Intensity-dependent evolution of excess dynamic disorder due to nonthermal phonons manifests itself in pump-probe experiments as dispersion-type differential spectrum appearing at high pump intensity. The third-order nonlinear susceptibility of PIC aggregates has been calculated supposing highest density packing. The nonlinear figure of merit of aggregates was evaluated which is intensity dependent due to exciton annihilation and associated subsequent processes.
dc.language.isoen
dc.publisherAmerican Institute of Physics
dc.title.enWavelength and intensity-dependent transient degenerate four-wave mixing in pseudoisocyanine J-aggregates
dc.typeArticle de revue
dc.subject.halPhysique [physics]
dc.subject.halPhysique [physics]/Physique [physics]/Optique [physics.optics]
bordeaux.journalJournal of Chemical Physics
bordeaux.page8374-8383
bordeaux.volume106
bordeaux.issue20
bordeaux.peerReviewedoui
hal.identifierhal-01550175
hal.version1
hal.popularnon
hal.audienceInternationale
hal.origin.linkhttps://hal.archives-ouvertes.fr//hal-01550175v1
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