Journal Article Research Support, Non-U.S. Gov't Research Support, U.S. Gov't, Non-P.H.S. angle-independent structural color anodized aluminum oxide membranes bilayer elastomeric films buckling instability dry adhesion foldable structures hierarchical structure nanoindentation nanovoids pattern transformation quasi-amorphous nanoparticle arrays reconfigurable structures shape effect smart window smart windows tapered polymer nanopillars tilted micropillars tunable transmission wrinkling