Before revision: The 100 nm diameter needles were cut from silicon AFM tips using focused ion beam etching.Nanoneedle gets into cells - nanotechweb.org The University of California, Berkeley in 2008 produced gallium arsenide (GaAs) nanoneedles which emit extremely bright light, though not yet lasers, when optically pumped.
After revision: Atomic Force MicroscopyThe 100 nm diameter needles were cut from silicon AFM tips using focused ion beam etching.Nanoneedle gets into cells - nanotechweb.org The University of California, Berkeley in 2008 produced gallium arsenide (GaAs) nanoneedles which emit extremely bright light, though not yet lasers, when optically pumped.