Ms. Yukiko Yamada Profile

Yukiko Yamada

at Keio Univ

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Proceedings Article | 12 February 2009 Paper

Birefringence analysis of a photonics polymer doped with a birefringent crystal

Yukiko Yamada, Akihiro Tagaya, Yasuhiro Koike

Proceedings Volume 7213, 72130W (2009) https://doi.org/10.1117/12.807606

KEYWORDS: Birefringence, Polymers, Crystals, Polymer thin films, Refractive index, Transparency, Statistical analysis, Photorefractive polymers, Photoelasticity, Doping

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The purpose of this study is to design an optimal strontium carbonate (SrCO₃) crystal which can effectively compensate the orientational birefringence of polymers. Additionally, we try to compensate large positive birefringence which polycarbonate (PC) exhibits. Furthermore, we analyze the orientational behaviors of the crystals in biaxially drawn polymer films. As a result of the measurement of orientational birefringence of the polymer films doped with SrCO₃ with various average sizes and aspect ratios and estimation of orientation function of the crystals, we found out that SrCO₃ with higher aspect ratio and larger size had higher compensation efficiency for the birefringence. As a result of measurement of transparency, we found out that the copolymer film doped with SrCO₃ with higher aspect ratio and larger size was less transparent. Therefore, it was suggested that we should design an optimal crystal for particular purposes from the standpoint of the birefringence compensation efficiency and transparency when we apply this method to an optics application. Additionally, we succeed in designing a zero birefringent PC by doping with SrCO₃. Furthermore, we found out that SrCO₃ was aligned in a perpendicular direction to the thickness direction and was randomly oriented in planar direction in biaxially drawn polymer films.

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