| abstract |
(57) [Summary] [Object] To provide a method for producing a polysiloxane-based optical waveguide having low loss in the visible to near-infrared region and excellent in heat resistance, and a polymer useful for the method. [Configuration] Formula 1: - [- Si (-R 1) (- R 2) -O-] 100-m - [- Si (-R 3) {- R 4 - C (Z) 2 Cl} -O-] m - or corresponding cyclic polysiloxane [wherein R 1 to R 3 which is -C n Y 2n + 1 or -C thereof 6 Y 5 (Y is H, D or halogen, C 6 is benzene ring, n is 5 or less positive integer), R 4 is -C 6 Y 4 -, Z is H Alternatively, D, m <100, and Y is a (co) polymer having a repeating unit of which at least part is D], which is a polymer for forming an optical waveguide. A method for producing a polysiloxane-based optical waveguide, in which the core portion is formed by irradiating far ultraviolet rays or electron beams to insolubilize the polymer used and remove unnecessary portions. |