Figure 2
From: Nanofocusing of hard X-ray free electron laser pulses using diamond based Fresnel zone plates
Diamond Fresnel zone plates.
(a) Overview of FZPs etched into a 1.5 mm diameter diamond membrane. The 500 µm diameter of the central FZP is matched to the beam size at the LCLS-XPP end station. (b) Central rings etched 2.1 µm deep. (c) 100 nm wide outermost zones.
