Ga nanoparticle
(a) Schematic picture of the deposition process to form a gallium nanoparticle at a fibre tip. Below, scanning electron microscope images of the aperture of the fibre tip are shown (b) before and (c) after growth of the gallium nanoparticle. The size of the nanoparticle is 80 nm. (Credit: Phys. Rev. Lett.)