Materials for Photochemically-induced Photo-optical Control

本项目以光化学诱导光光控制器件材料的分子设计和表征为目标，通过测量聚合物薄膜中各种染料光异构化前后的折射率变化，建立化学结构变化与折射率谱之间的关系。我们测量了对二甲基偶氮苯(DAAB)、富里酸540、对甲氧基偶氮苯(MOAB)在PMMA膜和含降冰片二烯聚合物P(MMA-co-GMA-PncA)膜中光异构化过程中的折射率变化，实现了P(MMA-co-GMA-PncA)、P(MMA-co-GMA-PncA)、并利用Kramers-Kronig变换得到了连续的折射率谱。在此基础上，我们(1)阐明了化学结构与折射率变化之间的关系，并为有效的光光控制提供了分子设计指南，(2)估算了利用这些光异构化反应实现光光开关器件的最小能量，(3)在P(MMA-co-GMA-PncA)薄膜中制备了具有光光效应的光波导。

This project aims at the molecular design and presentation of materials for photochemically-induced photo-optical control devices, by measuring the refractive-index changes before and after the photoisomerization of various dyes in polymer films and establising the relationship between the changes in chemical structure and those in refractive index spectra.We measured the refractive-index changes durig photoisomerizations of p-dimethylazobenzene (DAAB), fulgide 540, and p-methoxyazobenzene (MOAB) in PMMA film as well as the films of norbornadiene-containing polymers, P (MMA-co-GMA-PNCA), realizing the very large refractive index change of 0.01 for P (MMA-co-GMA-PNCA), and also obtained continuous refractive-index spectra by using Kramers-Kronig transformation.Based on these results we (1) clarified the relationship between the chemical structure and refractiveindex changes, and the guide to molecular design for efficient photo-optical control, (2) estimated the minimum energy for realizing a photo-optical switching device by using these photoisomerization reactions, and (3) prepared a optical waveguide based on the phoropattering with the photo-optical effect in P (MMA-co-GMA-PNCA) films.