Fig. 4: Simulated Au/MoS2 images and reconstructions.
From: Sub-ångström resolution ptychography in a scanning electron microscope at 20 keV
a Simulated exit wave for a gold island on MoS2 using normally incident plane wave 20 keV illumination. b An enlarged view of the region indicated with the dashed yellow rectangle in (a) and (c), the plane wave illuminated exit wave from the same region when the sample is tilted at 2.9° from the MoS2 c-axis, and relative to the electron beam illumination. d Visualisation of the atoms at the edge of the modelled gold island, viewed from the electron beam direction, where the sample is tilted at 2.9°. The gold island is modelled as having a frustrum geometrical from (see Supplementary Information) and thus has a tapered edge, seen by the gradually increasing number of gold atoms at the edge. e Exit-wave produced from a ptychographic reconstruction performed upon simulated diffraction data where the sample is tilted. The colour scale for the presented amplitude and phase in parts of (a–c and e) is shown in the lower left. Scalebars: (a) – 2 nm; (b, c, e) – 1 nm, (d) – 0.5 nm.
