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Proceedings Paper

Nonlinear refractive indices of polydiacetylene microcrystals
Author(s): 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
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Paper 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.

Paper Details

Date Published: 23 January 1997
PDF: 8 pages
Proc. SPIE 2998, Photosensitive Optical Materials and Devices, (23 January 1997); doi: 10.1117/12.264187
Show Author Affiliations
Hiro Matsuda, National Institute of Materials and Chemical Research (Japan)
Shinji Yamada, National Institute of Materials and Chemical Research (Japan)
Edward R. Van Keuren, National Institute of Materials and Chemical Research (Japan)
Hideyuki Katagi, Tohoku Univ. (Japan)
Hitoshi Kasai, Tohoku Univ. (Japan)
Shuji Okada, Tohoku Univ. (Japan)
Hidetoshi Oikawa, Tohoku Univ. (Japan)
Hachiro Nakanishi, Tohoku Univ. (Japan)
Euan C. Smith, Heriot-Watt Univ. (United Kingdom)
Ajoy Kumar Kar, Heriot-Watt Univ. (United Kingdom)
Brian S. Wherrett, Heriot-Watt Univ. (United Kingdom)

Published in SPIE Proceedings Vol. 2998:
Photosensitive Optical Materials and Devices
Mark P. Andrews, Editor(s)

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