PRODUCTION OF SYNTHETIC RESIN OPTICAL CIRCUIT

摘要

PURPOSE:To form an optical waveguide having a high refractive index in a transparent substrate by manufacturing a substrate of a transparent gel having a projecting line by superposing partly a monomer forming a network polymer, and diffusing a monomer forming a polymer having the lower refractive index thereby polymerizing the same. CONSTITUTION:A monomer Ma forming network polymer Pa having a refractive index Na is partly superposed to manufacture a substrate 1 of a transparent gel. A projecting line 2 is formed on the substrate so as to correspond to the pattern for a prescribed optical waveguide on the one surface 1A side thereof in one body with the substrate 1. A monomer Mb forming a polymer Pb having the refractive index Nb smaller than the refractive index Na of the polymer Pa is diffused from the surface side formed with the line 2 into the substrate 1 and is thus polymerized. The diffusion penetration of the monomer is slower in the base part of the line 2 than in the part right under the plane part 1A and therefore an optical waveguide 3 having the refractive index distribution wherein the refractive index at the center is largest and decreases toward the periphery is formed.