Photoinduced refractive index changes of polymer films ocntianign photochromic dyes and evlauton of the minimal switching energy

摘要

Refractive index spectra and their changes were measrued from some polymers during photochromic reactions.A poly (methly mehtacrylate)copolymer,P(MMA-co-GMA-PNCA),which includes nor=bornadiene groups shows large photoindued refractive index changes of ca.0.01 in a transparent wavelength region.refractive index changes for PMMA films contianing photochromic dyes are of the order of 10~-3.THe properites of a Mach-Zehnder photo-opticla switchign deices using a fulgide derivatiove or p-methoxtyazobenzene were evalautee by ondsieign a relationship betwen absorptin losses and wavelentth dependence of rerfractive index changes.