[OPTICAL REVIEW Vol. 2, No. 1 (1995) 20-23]

Multi-Layered Optical Storage with Nonlinear Read/Write

Kiyoshi KOBAYASHI1 and Satoru S. KANO2

1IBM Japan Ltd., and Information Technology Solutions Co., Fujisawa, Kanagawa, 252 Japan, 2IBM Research, Tokyo Research Laboratory, Yamato, Kanagawa, 242 Japan

(Received August 22, 1994; Accepted September 1, 1994)

A new concept of three-dimensional (3D) optical storage is proposed based on a multi-layered thin-film structure and a nonlinear optical (NLO) read/write process. Theoretical analysis of the device indicates that a 20-fold increase in total volume density can be expected without any compensating primary spherical aberration, owing to the lateral superresolution and the multi-layer structure in the vertical direction.

Key words : multi-layered optical storage, nonlinear optical process, THG, resolution, theoretical modeling