M. Bischoff et al., SCANNING TUNNELING INDUCED LUMINESCENCE IN SEMICONDUCTORS AND METAL-FILMS, International journal of electronics, 77(2), 1994, pp. 205-212
The scanning tunnelling microscope can be used to study several phenom
ena in addition to producing highly resolved topographic information f
rom surfaces. One of these phenomena is the luminescence which has bee
n observed from the surfaces of semiconductors or thin metallic films
because the recombination process of minority carriers injected into a
semiconductor is partly radiative. Electrons tunnelling to a metallic
surface are able to induce surface plasmons which partly decay by emi
tting photons.