抄録
An RGB reflecting multilayer including azobenzene-polymer liquid crystal has been studied. The azobenzene-polymer liquid crystal has a photoinduced reversible refractive index based on photoisomerization. By using the reversible refractive-index change, the reflectance of the multilayer including azobenzene-polymer can be controlled. In this system, the azobenzene molecules change their conformation as a result of a cis-trans transition when they are irradiated with ultraviolet (UV) light. Unfortunately, in a thick multilayer, UV light does not reach the bottom part of the multilayer because UV light is mainly absorbed at its top surface. To solve this problem, the thickness ratio of the multilayer has been studied. We found that an RGB reflection appears by stacking thin azebenzene layers and thick other layers. This is because that the asymmetric periodic structure consists of many frequency components.
