Abstract
A two-step high field anodization and a controllable barrier layer removing process havebeen used for the fabrication of porous anodic alumina (PAA) with different morphologies.Based on the PAAs, porous noble metal films with widely tunable pore size and inter-poredistance have been realized by a simple sputtering method. Their morphology and opticalproperties were studied with a field-emission scanning electron microscope, and ultravioletand ultraviolet–visible spectrophotometers. An enhanced light transmission of thenanoporous metal films was detected. The transmissivity of a normal incidence light can beenhanced over ten times within a certain selected wavelength range. The intensity andposition of the transmission peak depend on the morphology and porosity of the metalfilms.
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