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Ortho ‐Nitrostilbenes in Polycarbonate for Holographic Data Storage
Author(s) -
Erben C.,
Boden E. P.,
Longley K. L.,
Shi X.,
Lawrence B. L.
Publication year - 2007
Publication title -
advanced functional materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 6.069
H-Index - 322
eISSN - 1616-3028
pISSN - 1616-301X
DOI - 10.1002/adfm.200600943
Subject(s) - polycarbonate , materials science , holographic data storage , refractive index , holography , shrinkage , doping , optics , absorption (acoustics) , optoelectronics , analytical chemistry (journal) , composite material , organic chemistry , chemistry , physics
Holographic data storage materials based on dye‐doped polycarbonate that could find application in professional archival and consumer applications are described. The dyes are selected from the class of o‐nitrostilbenes, which irreversibly bleach under exposure to light and show high thermal stability before and after exposure. The reduction in concentration of the dye in the host after exposure induces refractive index variations over a wide range of wavelengths and extends well away from the dye absorption peak conforming to the Kramers–Kronig relationship. The materials are injection moldable into the standard disc format and have negligible shrinkage during data storage. Samples were produced using different dyes and various concentrations in a polycarbonate host and processed on professional CD/DVD equipment. The refractive index change is as high as 0.04, with a measured instantaneous sensitivity of 0.5 cm J –1 and M /# = 0.3.