Optical data storage system for recording and/or reading and...

G - Physics – 11 – B

Patent

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G11B 7/24 (2006.01) G11B 7/135 (2006.01)

Patent

CA 2562882

Multi layer near-field optical recording using a moderate numerical aperture (NA) is superior to the high-NA (NA=2.0) first-surface single-layer technique. The use of very flat and thin spacer layers limits spherical aberration due to difference in layer depth. The thin spacer layers may have a high refractive index because their thickness allow for a relatively high absorption constant. This makes possible in principle an m-layer system, e.g. m = 4, with NA=1.6 which may include a flat, protective cover layer. Further a medium for use in such a system is described.

L'invention concerne une technique d'enregistrement optique multicouche à champ proche utilisant une ouverture numérique (NA) modérée supérieure à la technique monocouche à première surface à NA élevée (NA = 2,0). L'utilisation de couches intercalaires très plates et fines limite les aberrations sphériques dues à une différence de profondeur de couche. Les couches intercalaires minces peuvent posséder un indice de réfraction élevé du fait que leur épaisseur présente une constante d'absorption relativement élevée, ce qui en principe permet d'obtenir un système m couches, par exemple, m = 4 et NA = 1,6 pouvant comprendre une couche protectrice de recouvrement. L'invention concerne également un support utilisé dans ledit système.

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