Figure 6
(a) Schematic of a front-side zone offset a distance loff with respect to the corresponding back-side zone. Tilting angle α will realign the centres of mass of the two zones and should maximize the diffraction efficiency of the total structure. (b) Zone plates with different degrees of misalignment, chosen for the tilting measurements. The diagonal fringes on zone plate F indicate a strong misalignment along both the x and the y directions. |