Figure 1

Bowtie nanoantennas fabricated on single-crystal and polycrystalline Au films. (a) Cartoon of the FIB milling of a single-crystal gold Au(100) film with an incident beam of Ga3+ ions (red) to realize a monocrystalline bowtie nanoantenna. (b) Top-view SEM images of bowtie antennas fabricated on monocrystalline (left) and polycrystalline (right) Au films, respectively. (c) Fabrication steps for the FIB milling of bowtie nanoantennas. For the structures fabricated here, L = 1560 nm, g = 20 nm.