Gold Atoms
This specimen is a nanofabricated plasmonic antenna. It was cut out of a 100 nanometer thick film of pure Gold, using advanced Focussed Ion Beam systems at ANL. At low magnfications you can see the shape of the two arrow shaped antenna, at high magnfication the atomic structure of the film is visible. The "white dots" at the highest magnification are atoms of Gold assembled in a hexagonal ordered array. The distance between the atoms is approximately 0.14 nanometers.