Yoshio Kishimoto

Multiple Optical Memory using Photochromic Spiropyran Aggregates

Abstract Multiple recording technology is particularly important for the high density optical memory. Through investigating the aggregate—forming ability of the new photochromic spiropyrans, we have developed five novel spiropyrans, the aggregates of which have sharp absorption bands at different wavelengths. We have fabricated a recording medium stacked with the five kinds of aggregate layers and confirmed ten multiple optical recording characteristics by combining the five multiple frequency recording with the recording by two mutually perpendicular linear—polarized lights.

Spiropyran Aggregates for Multiple Optical Memory

Abstract Investigating the aggregate-forming ability of the new synthesized photochromic spiropyrans, we have developed novel five spiropyran aggregates each of which has a sharp absorption band at different wavelength. We have fabricated a recording medium stacked with the aggregate layers, and confirmed 10-multiple optical memory by means of combining the multi-frequency recording with the recording by two mutually perpendicular linear-polarized lights.