The fabrication of three-dimensional (3D) Au nanoporous films with
pores the size of ~200nm by laser-induced modification of as-prepared Au flat films is reported. This SEM image is of a modified Au film by laser irradition with a laser power of 12 GW/cm2. See Jiao et al. Opt. Mater. Express 7, 1557-1564 (2017).