Influence of metal roughness on the near-field generated by an aperture/apertureless probe
We study the influence of metal roughness on the near-field distribution generated by an aperture or an apertureless (scattering) probe. Different experimental parameters are investigated: roughness magnitude, aperture form, distribution of the roughness. Our results show that aluminium roughness has a dramatic impact on the emission characteristics of a near-field probe and in particular on its polarization sensitivity. Apertureless or scattering probes appear to be less sensitive to roughness and to provide a well confined field even with a somewhat rough probe.
Keywords: aperture probe ; apertureless probe ; contrast mechanisms ; image formation ; local probe microscopy ; near-field optics ; numerical simulations ; scattering probe ; surface roughness ; Optical Microscopy ; Contrast
Record created on 2011-04-11, modified on 2016-08-09