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HYBRID FILMS CONSISTING OF A CLAY AND A DIACETYLENIC, TWO-PHOTON ABSORPTIVE DYE

¹ Department of Chemistry, Faculty of Science, Yamaguchi University, Yamaguchi, 753-8512, Japan
² National Institute of Advanced Industrial Science and Technology (AIST), Ikeda, Osaka, 563-8577, Japan

^* E-mail address of corresponding author: j_kawa{at}yamaguchi-u.ac.jp

Hybrid films consisting of Sumecton SA smectite (SSA) and a diacetylenic two-photon absorptive dye; 1,4-bis(2,5-dimethoxy-4-{2-[4-(N-methyl)pyridinium]ethenyl}phenyl) butadiyne triflate (MPPBT) were fabricated. The MPPBT-clay composites were prepared by the cation exchange method in a dimethylsulfoxide (DMSO)-water mixed solvent. A low-light-scattering film, suitable for use in optical devices, was obtained by filtration of the dispersion of the MPPBT-clay composites. Estimation of the two-photon absorption cross-section (⁽²⁾) by means of the open-aperture Z-scan technique was performed using the present film. The ⁽²⁾ value of MPPBT in the film fabricated at the MPPBT loading levels vs. 20% cation exchange capacity was 1030 GM (1 GM = 1x10⁵⁰ cm⁴ s photon^–1 molecule^–1) at an excitation wavelength of 800 nm. The value was 1.3 times greater than the maximum value of the ⁽²⁾ of MPPBT dissolved in DMSO without clay.

Key Words: Diacetylenic Dye • Film • Synthetic Saponite • Two-photon Absorption