Scanning Near-Field Optical Microscopy will be presented as a new and
promising technique for testing of electronic devices. The non-destruc
tive working principle of the instrument and contactless testing capab
ility are inherent advantages of this experimental set-up. Subwaveleng
th resolution can be achieved routinely under various conditions on te
st samples and relevant systems of interest. Contrast mechanisms like
fluorescence and luminescence are well known from the literature and c
ould be applied to the electron and optical beam testing of electronic
devices. Possible experimental set-ups for this kind of investigation
s are discussed. The use of collection mode SNOM for registration of u
ltrafast phenomena has been demonstrated [8].