Figure 1

(Color online) (a) Schematic of the HHG laser and diffraction imaging experimental setup. (b) HHG source spectrum deduced from the Young’s double-slit experiment. The light incident on the sample consists of approximately six well-defined harmonics of the driving optical laser.Reuse & Permissions

Figure 2

(Color online) Diffraction data acquired from the sample. This consists of the combination of two different exposure times so as to allow for the measurement of the very intense low-angle scatter and the relatively low intensity high-angle scatter. The data is displayed on a highly nonlinear scale.Reuse & Permissions

Figure 3

(Color online) Flow diagram for the image reconstruction algorithm. The reconstruction takes place in two sections. The first, denoted output 1, is the image from the modified Gerchberg-Saxton iteration. The second, output 2, is a maximum entropy method refinement step.Reuse & Permissions

Figure 4

(Color online) (a) A scanning electron microscope image of the sample used in the diffraction experiment. (b) Output from the first stage, Gerchberg-Saxton, of the iterative scheme. The dotted circle indicates the support assumed in the reconstruction. (c) Output after the maximum entropy methods step of the data reconstruction. (d) The line out through one of the small pinholes shows the curve fitting used to estimate the spatial resolution of $(165\pm 5)\mathrm{mm}$. This resolution is consistent with diffraction-limited imaging at a wavelength of about $35\mathrm{nm}$ with this experimental geometry.Reuse & Permissions