Improved third-order nonlinear optical properties of polydiacetylene derivatives

Shuji Okada, Hachiro Nakanishi, Hiroshi Matsuzawa, Hideyuki Katagi, Toshiyuki Oshikiri, Hitoshi Kasai, Abhijit Sarkar, Hidetoshi Oikawa, Raul Rangel-Rojo, Takashi Fukuda, Hiro Matsuda

Research output: Contribution to journalConference articlepeer-review

14 Citations (Scopus)


In order to improve third-order nonlinear optical properties of polydiacetylenes (PDAs), we have been investigating modification of PDA structures. From the point of view of PDA molecular design, three series of monomers for ladder-type PDAs were prepared. Oligoyne monomers having more than five conjugated acetylenes gave polymers which showed broad bands at longer wavelength than their excitonic absorption bands. This implies production of π-conjugated ladder polymer having two PDA backbones linked by acetylenic groups in each repeating unit. From monomers with two butadiynes connected by an alkylene group, ladder-type PDAs were obtained when the carbon number of the alkylene group is more than four. However, monomers with two butadiynes connected by an arylene group gave only single-chain PDAs. From the point of view of PDA morphological engineering, PDA microcrystal water dispersions were applied to evaluate nonlinear optical susceptibilities (χ(3)) by z-scan method together with PDA thin films. High-density microcrystal deposited film prepared by layer-by-layer deposition technique showed more than three orders of magnitude enhanced χ(3) than the dispersion state. Polycrystalline thin films compose of ladder-type PDAs were also found to have large χ(3). The quite large nonlinear refractive index of -41 cm2/GW was attained just near excitonic absorption maximum for one of the polymers.

Original languageEnglish
Pages (from-to)76-87
Number of pages12
JournalProceedings of SPIE - The International Society for Optical Engineering
Publication statusPublished - 1999
EventProceedings of the 1999 Organic Nonlinear Optical Materials - Denver, CO, USA
Duration: 1999 Jul 191999 Jul 22


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