<title>High bit rate and terabytes optical memory in a disk system</title>

Abstract

A very high density optical disk system is newly proposed. The system uses a laser diode array consisting of 100 X 100 (equals 10 thousands) VCSELs (vertical cavity surface emitting lasers) with a very small center hole on each output mirror of each cavity. Each 10 thousand laser diodes can emit evanescent wave on a surface of optical disk medium and can write information bits on it. Each 10 thousand tracks can be written and read at once, by inclining the array about 0.57 degrees toward to a tangential direction of the rotating disk. The Each track that is about 20 nm width doesn't has any borderline between tracks, which means that the total 10 thousand tracks can be traced electrically at once with 199 micron meter width. The new system enable us to write and read information as rapidly as 10 GByte/sec and to store data up to 2 Tera Bytes on one surface of 5.25' disk.