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Figure 3
Variation with D of the fundamental (m = 1), the second (m = 2) and the third harmonic (m = 3) of the variation along the (a), (c), (e) horizontal and (b), (d), (f) vertical directions, for the two-dimensional phase grating with period 8 µm. The circles correspond to the experiments, whereas the solid lines correspond to simulations. Best fits were obtained assuming a ratio w of the binary grating equal to 0.465. The simulations include a correction factor taking into account the decrease of the detector sensitivity when the spatial frequency under consideration is increased. This correction factor was adjusted such that the simulation agrees with the experimental data point with the highest value. The remaining discrepancies between the simulations and measurements may be attributed partly to imperfections in the modeling of the grating.

Journal logoJOURNAL OF
SYNCHROTRON
RADIATION
ISSN: 1600-5775
Volume 11| Part 6| November 2004| Pages 476-482
https://doi.org/10.1107/S0909049504024811
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