Nonlinear refractive indices of polydiacetylene microcrystals

Hiro Matsuda, Shinji Yamada, Edward R. Van Keuren, Hideyuki Katagi, Hitoshi Kasai, Shuji Okada, Hidetoshi Oikawa, Hachiro Nakanishi, Euan C. Smith, Ajoy K. Kar, Brian S. Wherrett

Research output: Contribution to journalArticlepeer-review

24 Citations (Scopus)


Polydiacetylene microcrystals in a water suspension or a polymer matrix were prepared by a simple precipitation procedure in order to obtain a thin samples with good optical quality maintaining the characteristics of crystalline materials. The nonlinear refraction, n2, and nonlinear absorption, ß, around the exciton peak were measured by z-scan method using a tunable picosecond laser. The signs of the n2 are positive/negative at wavelengths shorter/longer than the exciton peak and strong saturable absorption, which ß is negative, are observed around the peak. The largest n2 was obtained to be plus 0.024 cm2/GW (Re ?(3) = +1.4 × 10-9 esu) at 640 nm for a gelatin composite film containing 24 wt percent of polydiacetylene microcrystals. ©2005 Copyright SPIE - The International Society for Optical Engineering.

Original languageEnglish
Pages (from-to)241-248
Number of pages8
JournalProceedings of SPIE - the International Society for Optical Engineering
Publication statusPublished - 1997
EventPhotosensitive Optical Materials and Devices - San Jose, CA, United States
Duration: 12 Feb 199712 Feb 1997


  • Nonlinear absorption
  • Nonlinear refractive index
  • Organic microcrystal
  • Polydiacetylene
  • Z-scan method


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