Abstract
We present an exact calculation of Maxwell's equations for a tip-metallic interface configuration by using a nonlocal boundary condition. The system is two dimensional, and consists of a cylinder at subwavelength distance from a corrugated surface of Ag or W. Both media are described by a frequency-dependent complex dielectric constant. The plasmon intensity has a huge enhancement, which is maximum when the tip-surface distance is about 1 nm, and it is sensitive to variations of 0.1 nm. This can account for recent experimental data on atomic resolution in photon emission by scanning tunneling microscopy operating at a constant current mode by Berndt et al. \textcopyright{} 1996 The American Physical Society.
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