We have investigated the relation between the scanning-tunneling-microscope (STM) tip shape and the efficiency of STM light emission. The light intensity radiated by a current source placed in the tip-sample gap of the STM was calculated for various shapes of the tip using the finite differential time 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 of 90°C.
ASJC Scopus subject areas
- Physics and Astronomy (miscellaneous)