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Proceedings Paper

Optical data storage in photochromic compounds
Author(s): William Dallari; Marco Scotto d'Abbusco; Elena Samoylova; Francesca Pignatelli; Athanassia Athanassiou; Roberto Cingolani; Alberto Diaspro; Marco Allione
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Paper Abstract

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.

Paper Details

Date Published: 21 February 2011
PDF: 7 pages
Proc. SPIE 7935, Organic Photonic Materials and Devices XIII, 793510 (21 February 2011); doi: 10.1117/12.879839
Show Author Affiliations
William Dallari, Italian Institute of Technology (Italy)
Univ. of Genoa (Italy)
Marco Scotto d'Abbusco, Italian Institute of Technology (Italy)
Elena Samoylova, Italian Institute of Technology (Italy)
Francesca Pignatelli, Italian Institute of Technology (Italy)
Athanassia Athanassiou, Italian Institute of Technology (Italy)
Roberto Cingolani, Italian Institute of Technology (Italy)
Alberto Diaspro, Italian Institute of Technology (Italy)
Univ. of Genoa (Italy)
Marco Allione, Italian Institute of Technology (Italy)

Published in SPIE Proceedings Vol. 7935:
Organic Photonic Materials and Devices XIII
Robert L. Nelson; François Kajzar; Toshikuni Kaino; Yasuhiro Koike, Editor(s)

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