Three-dimensional optical data photochromic materials

Kawata, S., Kawata, Y., Three dimensional Optical Data Storage Using Photochromic Materials, Chem. Rev. 2000,100, 1777 1788. 

Three-dimensional optical data storage using photochromic materials (spirobenzopyrans, dihetarylethenes, azobenzene derivatives 00CRV1777. 

There are two ways to achieve higher density the extension of the data-recording space in the axial direction, and the reduction of bit size. In this chapter, we describe a method for overcoming the density limit, namely, introduce an additional axial dimension in the recording process. " " The z or longitudinal axis is used in addition to the surface dimension (x—y space) of conventional optical memory. The data are thus written not on the material surface but within the three-dimensional (3D) thick volume. The media that can be used are photochromic materials. ... 

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