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 Kumar Kar; Brian S. Wherrett

doi:10.1117/12.264187

23 January 1997 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 Kumar Kar, Brian S. Wherrett

Author Affiliations +

Proceedings Volume 2998, Photosensitive Optical Materials and Devices; (1997) https://doi.org/10.1117/12.264187
Event: Photonics West '97, 1997, San Jose, CA, United States

Abstract

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, (beta) , 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 (beta) is negative, are observed around the peak. The largest n₂ was obtained to be plus 0.024 cm²/GW (Re_(chi ⁽³) equals plus 1.4 multiplied by 10^-9 esu) at 640 nm for a gelatin composite film containing 24 wt percent of polydiacetylene microcrystals.

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Hiro Matsuda, Shinji Yamada, Edward R. Van Keuren, Hideyuki Katagi, Hitoshi Kasai, Shuji Okada, Hidetoshi Oikawa, Hachiro Nakanishi, Euan C. Smith, Ajoy Kumar Kar, and Brian S. Wherrett "Nonlinear refractive indices of polydiacetylene microcrystals", Proc. SPIE 2998, Photosensitive Optical Materials and Devices, (23 January 1997); https://doi.org/10.1117/12.264187

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