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Large Photoinduced Refractive Index Change in a Polyimide Film by Charge‐Transfer Complex Formation with a Polymer‐Bound Phenylazide Fragment
Author(s) -
Kashiyama Yuuki,
He Jionghao,
Machida Shinjiro,
Horie Kazuyuki
Publication year - 2001
Publication title -
macromolecular rapid communications
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.348
H-Index - 154
eISSN - 1521-3927
pISSN - 1022-1336
DOI - 10.1002/1521-3927(200102)22:3<185::aid-marc185>3.0.co;2-c
Subject(s) - polyimide , refractive index , moiety , materials science , polymer , transmittance , polymer chemistry , imide , high refractive index polymer , optoelectronics , layer (electronics) , composite material , chemistry , organic chemistry
A large photo‐induced refractive index change as large as 0.014 at 632.8 nm in thermostable transparent polymer films has been realized for the first time by using photoirradiation of polyimide precursor films containing a phenylazide and successive imidization. The phenylazide fragment forms a charge‐transfer complex with imide moiety. The films maintained high transmittance in a wide visible region in contrast to usual polyimide films. This value of refractive index change is sufficient to make thermostable channel waveguides and other optical devices.