Table 1. Comparison of Optics for Generating Micro-Beams for Hard X-ray XFIa.
| apertures | Kirkpatrick–Baez mirrors | capillaries | Fresnel zone plates | |
|---|---|---|---|---|
| max X-ray energy | N/A | 30 keV | 20–40 keV | 30 keV |
| typical resolution | 50–100 μm | 2–20 μm | 1–20 μm | 150–300 nm |
| best resolution | ca. 20 μm | 40 nm | 1 μm | 60 nm |
| focal length | N/A | several cm | 0.1–5 mm | several cm |
| disadvantages | inefficient (low photon flux), poor resolution | short focal length | energy-dependent focal length |
a
Only commonly used optics are considered; values given are those for an X-ray energy of 10 keV.