A multi-layer biocidal structure includes a support. A structured bi-layer is located on or over the support. The bi-layer includes a first cured layer on or over the support and a second cured layer on or over the first cured layer on a side of the first cured layer opposite the support. The structured bi-layer has at least one depth greater than the thickness of the second layer. Multiple biocidal particles are located only in the second cured layer.
