Extended Data Figure 1: Scanning electron microscope imaging of controlled undercuts.
From: Coherent suppression of electromagnetic dissipation due to superconducting quasiparticles
a, 500-nm-deep cut; b, 900-nm-deep cut. For the purpose of scanning electron microscope imaging, the entire structure is covered with a 10-nm layer of sputtered gold. Notice that the residual undercut on the right-hand side of the trenches is at least an order of magnitude smaller than the designed undercut.
