Proposal of high bit rate 2 T bytes optical memory disk system

Abstract

A very high density optical memory disk system is newly proposed. The system uses a laser diode array consisting of 100/spl times/100 (=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 write and read at once, by inclination of the laser diodes array about 0.57 degrees toward to a tangential direction of the disk. The disk track width is about 20 nm. Each track doesn't need any borderlines between tracks, which means that the total 10 thousand tracks can be traced at once with about a 199 micron meter width. The new system enable us to write and read information as rapidly as 10 G Byte/sec and to store data up to 2 Tera Bytes on one surface of an 120 mm optical disk.