Computational study of diffraction patterns for near-field Fresnel and Gabor zone plates
1School of Physics and Astronomy, University of Birmingham, UK. t.d.beynon@bham.ac.uk
Abstract:
Near-field designs of Fresnel and Gabor zone plates are computationally analyzed by using versions that allow the foci to be brought closer to the plate than in the usual far-field applications. It is found that the Fresnel plate has a dominant primary conjugate pair of foci well inside the far-field region and a more intense primary focus and smaller off-focal-plane sidelobes than the near-field Gabor systems, thus yielding a superior imaging performance.
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