Open AccessOptical transfer function of inverse-phase composite zone plate devised for deep-focusing X-ray microscopes
Author(s) -
Yasushi Kagoshima,
Yoshihisa Takayama
Publication year - 2021
Publication title -
japanese journal of applied physics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.487
H-Index - 129
eISSN - 1347-4065
pISSN - 0021-4922
DOI - 10.35848/1347-4065/ac2e69
Subject(s) - optics , microscope , contrast transfer function , optical transfer function , phase (matter) , point spread function , spurious relationship , inverse , spatial frequency , zone plate , transmission (telecommunications) , physics , transfer function , resolution (logic) , phase contrast microscopy , materials science , computer science , geometry , lens (geology) , artificial intelligence , diffraction , mathematics , telecommunications , spherical aberration , quantum mechanics , machine learning , engineering , electrical engineering
The optical transfer function (OTF) of an inverse-phase composite zone plate under incoherent illumination was numerically evaluated by convoluting the point spread function (PSF) and transmission distribution of a model sample with gradually changing spatial frequency. The PSF used in the simulation was obtained from our previous study on deep-focusing X-ray microscopes. As expected, the contrast in the sample image was lesser than that produced by a conventional zone plate. Phase-reversed contrast—spurious resolution—appeared at a high spatial frequency. Although the calculated OTF is slightly aberrated, its deep-focusing capability is advantageous for X-ray microimaging of thick samples.