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We show improvement of the optical and topographical resolution of scanning near-field optical microscopy by introducing a "tip-on-aperture" probe, a metallic tip formed on the aperture of a conventional fiber probe. The tip concentrates the light passing through the aperture. Thus the. advantages of aperture and apertureless scanning near-field optical microscopy are combined. Tips are grown by electron beam deposition and then covered with metal. Fluorescent beads are imaged with a resolution down to 25 nm (full width at half maximum) in the optical signal. The near-field appears strongly localized within 5 mn in z direction, thus promising even higher resolution with sharper tips. (C) 2002 American Institute of Physics.
