This could be seen as a series of coloured rings when the lens was viewed from above with a microscope: the visible light leaked through the thin gold film. (newscientist.com)
The fishnet consists of 20 alternating layers of gold films 30 nanometers thick and magnesium fluoride films 50 nanometers thick on a 50 nanometer thick silicon nitride membrane. (sciencedaily.com)
The metamaterial consists of silicon pillar arrays embedded in a polymer matrix and clad in gold film. (sciencedaily.com)