TWO-DIMENSIONAL OPTICAL ELEMENT AND ITS PRODUCTION

摘要

PURPOSE:To obtain a stable element of a fully solid state type which is thin, lightweight and sharp in contrast by constituting a coloring layer of the two- dimensional optical element of an oxide sputtered film contg. W and Li. CONSTITUTION:A coloring layer 21 is formed on a transparent electrode ITO 11 of a substrate 10 by sputter vapor deposition under 3X10<-2>Torr with a mixed oxide of Li and W as a target and Ar as sputtering gas. An ion conductive layer 22 is then formed by using the similar mixed oxide as a target and Ar/O2=1 as sputtering gas. ITO 14 is formed as a counter electrode on the layer 22 and an electric field is applied on the upper and lower electrodes to color and decolor the same. A difference by >=1 digit is observed in the stage of coloring and decoloring at the intensity of the transmitted light of an He-Ne laser with the element formed in such a way, thus the element is substantially usable as an optical element. The memory effect for a several months or above is further confirmed, and the two-dimensional optical element having the thin, lightweight and stable structure is realized.