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An Interpretation of the Correlation Between the Intensity of Scanning Tunneling Microscopy (STM) Induced Light Emission and the Topographic Height for the Metal Particles

The correlation between the intensity of Scanning Tunneling Microscopy(STM) induced light emission and the topographic height for metal particles is described. The topographic height dependence of the STM induced light emission from the STM induced dipole on the gold particles is calculated. The light emission is considered as the radiation from tunneling induced dipole, and the intensity is calculated as a function of the orientation of the dipole moment which depends on the position of the STM tip over the particles. The light intensity is nearly proportional to the topographic height of the particles. This result explains the linear correlation of the contrast between the photon intensity map and the STM topographic image.