Tip shape dependence of the light emission efficiency for the scanning tunneling microscope

Authors
Uehara, Y Suda, Y Ushioda, S Takeuchi, K
Citation
Y. Uehara et al., Tip shape dependence of the light emission efficiency for the scanning tunneling microscope, APPL PHYS L, 79(11), 2001, pp. 1718-1720
Citations number
13
Categorie Soggetti
Apllied Physucs/Condensed Matter/Materiales Science
Journal title
APPLIED PHYSICS LETTERS
ISSN journal
00036951 → ACNP
Volume
79
Issue
11
Year of publication
2001
Pages
1718 - 1720
Database
ISI
SICI code
0003-6951(20010910)79:11<1718:TSDOTL>2.0.ZU;2-3
Abstract
We have investigated the relation between the scanning-tunneling-microscope (STM) tip shape and the efficiency of STM light emission. The light intens ity radiated by a current source placed in the tip-sample gap of the STM wa s calculated for various shapes of the tip using the finite differential ti me domain method. We found that the highest emission efficiency is obtained for the pyramidal tip with the flat top of 4 nm width and the apex angle o f 90 degreesC. (C) 2001 American Institute of Physics.