Microstructured optical arrays

MOAs use total external reflection at grazing incidence from an array of small channels to bring x-rays to a common focus.

MOAs are used in applications that require x-ray focal spots in the order of few micrometers or below, such as radiobiology of individual cells.

Current MOA-based focusing optics designs have two consecutive array components in order to reduce comatic aberration.

MOAs are achromatic (which means the focal properties do not change for radiation of different wavelengths) as they utilize grazing incidence reflection.

2 where it can be seen that changing the gap between the components (d+D in the figure) or the radius of curvature (R) will have a large effect on the focal length.

Fig. 1- MOA with second component compressed
Fig. 2- Geometry of MOA in configuration shown in fig. 1
Fig. 3- MOA with both components compressed
Fig. 4- Geometry of MOA in configuration shown in fig. 2