Optical information storage mediums.

摘要

Optical information storage mediums which comprise a substrate and a recording layer made of a material which is capable of forming a J-aggregate and which exhibits a great variation in refractive index when absorbing light with a wavelength at which an absorption maximum takes place. The recording layer maybe made of at least two sub-layers of materials which, respectively, have greatly varying refractive indices by absorption of light. The medium needs no reflective layer or increasing a reproduction output.