Aperture probes for near-field optical microscopy were produced by controll
ed all solid state electrolysis. Control of both the ionic current and ligh
t transmission provided reproducible probe tips with aperture diameters in
the sub-50 nm range and flat end faces. High resolution scanning near-field
optical microscopy images were obtained with these probes. As a by-product
, the formation of an electrolytic nanometer-sized contact was observed. (C
) 2001 American Institute of Physics.