Multilayer disk recording using 2-photon absorption and the numerical simulation of the recording process

Two-photon absorption can be utilized to record multiple layers of bit-oriented data in inexpensive monolithic media offering an evolutionary path for high capacity volumetric storage. The feasibility of this approach has been demonstrated by recording 100 layers of data in 8 mm thick cube shaped polymer doped with a photochromic material. We report here the recording and read-out from 3-D optical disks made from similar materials. Multiple layer recording has been demonstrated by recording several data pages on three different layers within one of these disks.