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| - Enhanced Two-Photon Absorption of Chromophores Confined in Two-DimensionalNanospace
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| - We report the enhancement of molecular two-photon absorption (2PA) of a dicationic 2PA chromophore(MPPBT) by confining it in a two-dimensional (2D) nanospace formed in nanolayered silicate clay by thecation exchange method in a water−dimethyl sulfoxide mixture. The 2PA property of the MPPBT/silicatenanocomposite prepared from the mixture by casting is characterized by the femtosecond open-aperture Z-scanmethod. We found that the 2PA cross-section of the chromophore in the nanocomposite is enhanced by a fewtimes that of the dimethylsulfoxide solution at all wavelengths employed. This enhancement is accompaniedby a bathochromic shift of the 2PA peak. The origin of this enhancement is discussed in terms of lowdimensionality, suppressed internal twisting motion of the chromophore in the 2D confined space, and ionicinteractions with the silicate surfaces.
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