  Increasing miniaturization and complexity of nanostructures require
innovative metrology solutions with high throughput that can assess complex 3D
structures in a non-destructive manner. EUV scatterometry is investigated for
the characterization of nanostructured surfaces. The reconstruction is based on
a rigorous simulation using a Maxwell solver based on finite-elements and is
statistically validated with a Markov-Chain Monte Carlo sampling method. Here
it is shown that this method is suitable for the dimensional characterization
of the nanostructures and the investigation of oxide or contamination layers.
In comparison to grazing-incidence small-angle X-rayscattering (GISAXS) EUV
allows to probe smaller areas. The influence of the divergence on the
diffracted intensities in EUV is much lower than in GISAXS, which also reduces
the computational effort of the reconstruction.
