Patent ID: 9013272
Filing Date: 2015-04-21
Classification: B42D,H04L,Y04S,Y10S

Abstract:
1. A security document comprising an optical element embedded in a document substrate, said optical element comprising: a first nanohole array comprising a plurality of nanoholes arranged at nodes of a first two-dimensional periodic grid, said first two-dimensional periodic grid having a first periodic spacing between said nanoholes, said nanoholes comprising at least one dimension smaller than 400 nm; and a second nanohole array comprising a plurality of nanoholes arranged at nodes of a second two-dimensional periodic grid, said second two-dimensional periodic grid having a second periodic spacing between said nanoholes different from said first periodic spacing, said nanoholes comprising at least one dimension smaller than 400 nm; wherein said optical element comprises at least one of a metal film nanohole array and an electrically conductive film nanohole array; wherein said optical element is powered by at least one of: wherein said optical element is operable to produce at least one optical authentication effect.