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Proceedings Paper

Synthesis and optical properties of azo -dye-attached novel second-order NLO polymers with high thermal stability
Author(s): Takami Ushiwata; Etsuya Okamoto; Kyoji Komatsu; Toshikuni Kaino
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Paper Abstract

Novel second order nonlinear optical (NLO) polymethacrylate or polyacrylate polymers with high glass transition temperatures containing an azo dye attached as side-chain have been prepared using a new approach from polymethacrylic acid or polyacrylic acid as starting materials. Glass transition temperatures of 150 approximately 170 degree Celsius were obtained for Disperse red 1 dye attached polymethacrylic acid. These are attributed to the hydrogen bonding between the residual carboxyl groups in the starting polymers. Poled films by corona poling exhibited large NLO susceptibilities, (chi) (2)33 up to 53 pm/V at a wavelength of 1.3 micrometer. Due to the high glass transition temperatures of the polymers, long-term stability of the optical nonlinearity at 100 degrees Celsius was observed for 200 hrs or more. However residual carboxyl groups caused absorbance decrease mainly by hydrolysis of the ester bonds of the polymers investigated by UV-Vis absorption measurement. The stability of induced polar order of the NLO polymer was enhanced by using aminoalkyl chromophore and imidizing it thermally to introduce imide structure into the polymer main-chain. This imidized polymer exhibited (chi) (2)33 of 45 pm/V at a wavelength of 1.3 micrometer and maintained about 90% of the initial value after 230 hrs or more at 100 degrees Celsius.

Paper Details

Date Published: 15 June 2001
PDF: 8 pages
Proc. SPIE 4279, Organic Photonic Materials and Devices III, (15 June 2001); doi: 10.1117/12.429386
Show Author Affiliations
Takami Ushiwata, Tohoku Univ. (Japan)
Etsuya Okamoto, Tohoku Univ. (Japan)
Kyoji Komatsu, Tohoku Univ. (Japan)
Toshikuni Kaino, Tohoku Univ. (Japan)

Published in SPIE Proceedings Vol. 4279:
Organic Photonic Materials and Devices III
Bernard Kippelen; Donal D. C. Bradley, Editor(s)

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