Broadband metallic absorber on a non-planar substrate.

Absorbers for visible and near-infrared light are realized by depositing a thin iron layer on arrays of cones which are replicated from a porous template. The replicated conic structure itself is of several micrometers and ineffective at antireflection, but the subsequent deposition of iron on top generates nano-meter-size columnar structures, and thus broadband absorption enhancement is achieved.