Corrugated metal layer and optical structure including corrugated metal layer

An optical structure includes a lens layer and first and second mask layers that are optically opaque. The lens layer has a first major surface including a plurality of microlenses arranged in orthogonal first and second directions. The first and second mask layers are spaced apart from the first major surface and define a respective plurality of first and second through openings arranged in the first and second directions. The first mask layer is disposed between the structured first major surface and the second mask layer. The micro lenses are in one-to-one correspondence with the first openings and the second openings. The optical structure includes an intermediate layer disposed between the structured first major surface and the first mask layer, and including a corrugated second major surface facing and substantially registering with a corrugated third major surface of the first mask layer, the intermediate layer including a corrugated second major surface disposed between the structured first major surf