Position-selective emission control of cathodoluminescence using nanotips of optical fibers

Electron beams were irradiated at the nanotips of optical fibers inside a transmission electron microscope. Cathodoluminescence was directly guided through the fibers. The irradiated position and temperature were changed and spectra were analyzed. An improved cathodoluminescence method was demonstrated; the present method can be used as optical sources with photon energy of 1.7-3.0 eV.