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We provide an analytical solution to study the near field optical effect of acore-shell nanostructure in proximity to a flat surface, within quasi-staticapproximation. The distribution of electrostatic potential and fieldenhancement in this complex geometry are obtained by solving a set of linearequations. This analytical result can be applied to a wide range of systemsassociated with near field optics and surface plasmon polaritons. As anillustration of the power of this technique, we study the field attenuationeffect of oxidized shell in a silver tip in near field scanning microscope. Thethickness of oxidized layer can be monitored by measuring the light intensity.In addition, we propose a novel method to detect local temperature with spatialresolution down to nm scale, based on a Ag-Au core-shell structure.

Near-Field Optical Effect of a Core-Shell Nanostructure In Proximity to a Flat Surface