Fig. 2.

Fresnel diffraction patterns of single and double disks. Parameters: Ω = 4 mm, ω = 3 mm, and z − d = d = 0.1 m. Top panel: diffraction of disks Ω (top left quadrant A) and ω (bottom left quadrant B) alone. The right two quadrants (C) show the diffraction of the system of two disks. Vertical and horizontal lines correspond to ±Ω/2 (external black lines), ±ω/2 (blue dashed lines) and the geometrical limit of the dark zone (red lines) AB of Fig. 1 and Eq. (7). Bottom panel: zoom on the central region around the Arago spot. In this example, the gain in darkness is about 8.
Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.
Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.
Initial download of the metrics may take a while.