Tera bytes optical disk with electric tracking control using micro-cavity VCSEL array and PD array

Abstract

We have already developed a lensless optical floppy disk system. In this paper an ultra high density optical memory disk system of T bits/inch/sup 2/ with G bits/s data transfer rate is newly proposed using near field optics, of which tracks are electric controlled. The optical heads in this system use 100/spl times/100 microcavity VCSEL arrays. One track width on the disk is 20 nm which is fine controlled by an electrical method using a 150/spl times/150 photo-diode array and the whole head is controlled by a conventional optical and electric-mechanical method in seeking tracks.