Patent ID: 8529774

Claim:
A method, comprising: providing a multi-layer blank including a substrate layer having a substrate surface, a first layer over the substrate surface, and a second layer over a surface of the first layer; etching the second layer to form a plurality of spaced-apart nanoscale top features over the surface of the first layer, each nanoscale top feature having a diameter measured in a direction approximately parallel with the substrate surface; and etching the first layer to form a plurality of nanoscale raised features over the substrate surface, each of the nanoscale raised features supporting one of the nanoscale top features over the substrate surface, each of the nanoscale raised features having a length measured in a direction approximately perpendicular to the substrate surface, and each of the nanoscale raised features having a diameter at a point located along the length near the supported nanoscale top feature and measured in a direction approximately parallel with the substrate surface; wherein the plurality of nanoscale top features collectively forms a superlyophobic surface over the plurality of nanoscale raised features; and wherein an average of the diameters of the nanoscale top features is greater than an average of the diameters of each of the nanoscale raised features at the points.