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Figure 5
The attenuation factor of a 150 nm (black dashed line) and 60 nm (red line) thick aluminium, SiO2 and Si3N4 light-blocking filter deposited on the entrance window of the pnCCD sensor. The filter efficiently suppresses near-infrared, visible and ultaviolet radiation up to 10 eV by a factor 107 or 104, respectively. The influence of the aluminium absorption decreases due to the plasma frequency cutoff at ωp ≃ 16 eV resulting in the refractive index n becoming increasingly smaller between 15 eV and 73 eV, the Al L-edge.

Journal logoJOURNAL OF
SYNCHROTRON
RADIATION
ISSN: 1600-5775
Volume 28| Part 2| March 2021| Pages 576-587
https://doi.org/10.1107/S1600577520015659
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