A comparative study of the nonlinear optical properties of molecular J- and H-aggregates in thin films |
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Authors: | A I Plekhanov A I Gorkovenko N A Orlova A E Simanchuk V V Shelkovnikov |
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Institution: | 1.Institute of Automatics and Electrometry, Siberian Branch,Russian Academy of Sciences,Novosibirsk,Russia;2.Novosibirsk Institute of Organic Chemistry, Siberian Branch,Russian Academy of Sciences,Novosibirsk,Russia |
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Abstract: | A comparative study of the dispersion of nonlinear absorption in thin films of molecular J- and H-aggregates of polymethine
dyes was performed with the use of the Z-scan (Z-scan technique) over the range 625–825 nm under conditions close to resonance
absorption at nanosecond duration of excitation. The measurements were made on film samples of J- and H-aggregates prepared
by spin-coating and having identical absorption spectra. The H- and J-aggregates were formed by the synthetic thioflavylium
DT-3 and benzothiazole BTC18H dyes, respectively. It was found that the samples of different types of aggregates exhibit nonlinear
susceptibility of the same order of magnitude with allowance for the width of exciton absorption peaks. |
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