2002 Fiscal Year Final Research Report Summary
Hard X-ray Holographic Microscope for 3D Phase Reconstruction of Semitransparent Object
| Project/Area Number |
12450037
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Applied physics, general
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| Research Institution | University of Tsukuba |
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Principal Investigator |
WATANABE Norio University of Tsukuba, Institute of Applied Physics, Lecturer, 物理工学系, 講師 (80241793)
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| Co-Investigator(Kenkyū-buntansha) |
AOKI Sadao University of Tsukuba, Institute of Applied Physics, Professor, 物理工学系, 教授 (50016804)
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| Project Period (FY) |
2000 – 2002
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| Keywords | X-ray holography / Fourier transform holography / Gabor holography / X-ray microscope / Synchrotron radiation / Zone plate / Phase-contrast |
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| Research Abstract |
Gabor and lens-less Fourier transform holographic microscopes have been developed for the purpose of (a) high-resolution phase-contrast imaging, (b) quantitative phase imaging, and (c) 3D phase reconstruction. A combination of the x-ray undulator source of SPring-8 and a high-resolution zone plate enabled us to make a secondary coherent source as small as 100 nm size. Then, a tantalum line and space pattern as fine as 100 nm could be resolved both Gabor and lens-less Fourier transform holography at 10 keV. This is the highest resolution that has been reported in hard x-ray holography. The image of the lens-less Fourier transform holography was edge-enhanced one because the central region of the hologram had to be blocked. For quantitative phase imaging, a lens-less Fourier transform holographic microscope with a double zone plate interferometer was newly developed. Not only the edge pattern but also the inside flat field of a tantalum pattern could be reconstructed. Using this optical system, projection data for 3D phase tomography could be recorded and the reconstruction is currently under way. A Zernike-type hard x-ray phase-contrast microscope was also developed at the Photon Factory. A tantalum line and space pattern as fine as 100 nm could be clearly resolved at 9 keV.
To make a ID small x-ray source, total reflection from a limited mirror surface was also investigated. The reduction of the secondary source size was confirmed from the Gabor hologram of a gold wire illuminated with the reflected x-rays at 8 keV. This method can be used to make a small reference source of holography, the size of which determines the spatial resolution.
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