Molecular J-aggregates have attracted much attention because of ultrafast and large optical nonlinearity caused by excitonic resonance. Especially, porphyrin J-aggregates are materials of great interest since they are model substances for the light-harvesting mechanism in a system of antenna chlorophyll. In the present paper, we performed femtosecond pump-probe measurement of porphyrin J-aggregates and observed two new transitions from one-exciton to homo- and hetero-2-exciton states. Blue-shifted induced absorption was found around Q/sub x/-band due to the transition to homo-2-exciton states. J-aggregate size was estimated as N/spl ges/15 by using the energy shift from the monomer to the J-aggregates.


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    Titel :

    Various optical nonlinear processes in J-aggregates


    Beteiligte:
    Kobayashi, T. (Autor:in)


    Erscheinungsdatum :

    01.01.1999


    Format / Umfang :

    130120 byte




    Medientyp :

    Aufsatz (Konferenz)


    Format :

    Elektronische Ressource


    Sprache :

    Englisch



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