公开(公告)号：EP2145331B1

公开(公告)日：2011-01-26

申请号：EP08749913.3

申请日：2008-04-30

申请人： Commissariat à l'Énergie Atomique et aux Énergies Alternatives

发明人： MIMOUNI, Salim ,  LAULAGNET, Fabien

IPC分类号： G11B7/005 ,  G11B7/135 ,  G11B7/24 ,  G11B7/252 ,  G11B7/258

CPC分类号： G11B7/0052 ,  G11B7/005 ,  G11B7/1367 ,  G11B7/1398 ,  G11B7/24 ,  G11B7/252

摘要： The invention relates to the optical writing and reading of high-density information. The method comprises using the highest energy density at the centre of the reading laser beam for modifying the energetic structure of an active layer in order to make it capable of bearing surface plasmons. The coupling of the laser beam and the active layer thus modified can then excite the surface plasmons in an interface between a dielectric layer and the active layer. The surface plasmons are disturbed by physical marks having very small dimensions and written in the optical storage medium (10). These disturbances result in a remote-field optical response that can be detected by a detector (22). The operation is carried out in super-resolution, and the surface plasmons are generated only at the centre of the laser beam and not at the periphery thereof. It is thus possible to write and read again marks having dimensions lower that the theoretical resolution of the reading optical system.