The future of optical data storage and the search for next generation high-density technologies have become a topic
of lively debate. Three dimensional (3D) optical data storage, a relatively new technique which enables hundreds-layer
data recording in a hard memory, seems a viable candidate for this role. In this work, we report on 3D optical
data storage in photochromic compounds. The recording medium used in the experiments was a photochromic
diarylethenes derivative embedded in different host polymers. Multi-photon processes capability of triggering
photochemical reactions and physical changes with micrometer-sized resolution in three dimensions offers a well-suited
means to achieve volumetric storage densities. A commercial microscope coupled to pulsed NIR and CW
lasers have been used to write, read and erase data in our prototype memories. Information was recorded within the
volume of the media via a multi-photon process achieving high localized photoconversion and the fluorescence
emission from the photoconverted molecules when excited by a 405 nm laser diode was the readout signal. It is also
shown that data recorded in such a medium can be selectively erased by irradiating with 514 nm CW laser light
giving the chance to write new data in the formerly used memory space. These storage media, thus, have good
potentials to achieve volumetric storage of data although they certainly deserve further optimization work to achieve
high number of superposed layers and to assure durability of the written data under readout conditions.
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