Scanning tunnelling microscopy of silver island films showing second-harmonic generation at vertical fundamental incidence

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Abstract
Silver island films prepared by oblique evaporation show optical dichroism in the visible and second-harmonic generation at vertical incidence of the 1.06 mu m fundamental from a Nd YAG laser. Investigation by STM reveals that the observed optical properties can be well explained by the submicroscopic structure of the silver particles. Due to the preparation technique the silver particles are strongly tilted towards the direction of evaporation, thereby losing the rotational symmetry with respect to the surface normal.