| 摘要 |
An optical multilayer (1) comprising textured surfaces suitable for use in anti- counterfeiting and/or security applications is described. The optical multilayer (1) comprises at least two textured layers, said layers having different refractive indices, wherein each of the textured layers comprise at least one first region (7), said first region (7) comprising optical microstructures of constant periodicity, and each of the textured layers comprise at least one second region (8), said second region (8) comprising optical microstructures which are disordered. |
