Abstract

With the recent development of the information society, the amount of information handled increases year by year. Therefore, an increase in the speed and capacity of memory is required. On this basis, rapidity and parallelism of optical memory are highly advantageous for information processing, and the development of the optical memory with these characters is expected. There are several methods to attain high-density data storage such as miniaturizing recording bit itself, three-dimensionally structuring record layers, multiplexing recording wavelengths, and multiplexing polarizations [1]. By the present, in our laboratory, a media with three-dimensional multi-recording layers has been developed [2]. We have achieved the recording density 10 times a digital versatile disk (DVD). In addition to three-dimensional structure, we attempt to miniaturize the recording bit and to improve its reconstructing resolution by use of minute spheres.

© 2003 Optical Society of America