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Proceedings Paper

Zero-birefringent polyimide for polymer optical waveguide
Author(s): Sung-Ho Baek; Jae-Wook Kang; Xiangdan Li; Myong-Hoon Lee; Jang-Joo Kim
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Paper Abstract

A novel zero birefringent and photosensitive polyimide was synthesized. The polymer is soluble in solvents and contains a chalcone group for photo-crosslinking by UV exposure. The glass transition and decomposition temperature of the polymer were 254°C and 430°C before cross-linking. Evolution of the absorption spectra upon UV exposure indicated that the cross-linking reaction is related to the cycloaddition of the double bonds in the chalcone group to form cyclobutane. The photo-crosslinking reaction not only increased the thermal stability, but also induced a refractive index change of the films. The refractive index of the film was reduced upon UV exposure from 1.5862 to 1.5697 for TE mode and from 1.5807 to 1.5697 for TM mode, respectively, resulting in zero birefringence after curing. Loss of p-conjugation in the chalcone group by the crosslinking reaction is supposed to induce the reduction of the refractive indices and orbital change from sp2 to sp3 makes the polymer chain be kinked, resulting in decrease of birefringence. The polymer film showed optical loss of 0.41 dB/cm at 1.3 mm and 0.54 dB/cm at 1.55 mm. Zero birefringence and low optical loss combined with photo-processibility of the material are making it an excellent candidate for the high performance waveguide materials.

Paper Details

Date Published: 14 July 2003
PDF: 8 pages
Proc. SPIE 4991, Organic Photonic Materials and Devices V, (14 July 2003); doi: 10.1117/12.475462
Show Author Affiliations
Sung-Ho Baek, Kwangju Institute of Science and Technology (South Korea)
Jae-Wook Kang, Kwangju Institute of Science and Technology (South Korea)
Xiangdan Li, Chonbuk National Univ. (South Korea)
Myong-Hoon Lee, Chonbuk National Univ. (South Korea)
Jang-Joo Kim, Kwangju Institute of Science and Technology (South Korea)

Published in SPIE Proceedings Vol. 4991:
Organic Photonic Materials and Devices V
James G. Grote; Toshikuni Kaino, Editor(s)

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