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Morphological effects on the third-order nonlinear optical response of polydiacetylene nanofibers

  • Haruki Maki (a1), Rie Chiba (a1), Tsunenobu Onodera (a1), Hitoshi Kasai (a1), Rodrigo Sato (a2), Yoshihiko Takeda (a2) and Hidetoshi Oikawa (a1)...


The third-order nonlinear optical (NLO) susceptibility for morphologically controlled polydiacetylene (PDA) nanocrystals (NCs) and PDA nanofibers (NFs) have been determined for the first time by the experimental combination of transient pump-probe spectroscopy and spectroscopic ellipsometry. The figure of the merit of PDA NFs was much superior to PDA NCs and/or PDA bulk crystals, and the excitonic relaxation time was of order of sub-pico second. Namely, this is the first case to reveal the morphological effect on NLO response. PDA NFs having the long effective π-conjugation length are one of the most promising organic third-order NLO nanomaterials toward the photonic device application.


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Address all correspondence to Hidetoshi Oikawa at


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