| Budget Amount *help |
¥3,250,000 (Direct Cost: ¥2,500,000、Indirect Cost: ¥750,000)
Fiscal Year 2018: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Fiscal Year 2017: ¥260,000 (Direct Cost: ¥200,000、Indirect Cost: ¥60,000)
Fiscal Year 2016: ¥1,690,000 (Direct Cost: ¥1,300,000、Indirect Cost: ¥390,000)
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| Outline of Final Research Achievements |
An inverse-phase composite zone plate (ZP) is proposed to gain a deeper focus than the diffraction-limited depth of focus, with little reduction in spatial resolution. The structure is a combination of an inner ZP functioning as a conventional phase ZP and an outer ZP functioning with third-order diffraction with opposite phase to the inner ZP. Complex amplitude distributions neighboring the focal point were calculated using diffraction integration. The depth of focus and the spatial resolution were examined. Two characteristic promising cases regarding the depth of focus were found: a pit-intensity focus with the deepest depth of focus, and a flat-intensity focus with deeper depth of focus than usual ZP. It was found that twice the depth of focus could be expected with little reduction in the spatial resolution for 10 keV X-ray energy. It was also found that the depth of focus and the spatial resolution almost unchanged in the photon energy range from 8 to 12 keV.
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