Gabor Holography with Speckle-Free Spherical Wave in Hard X-ray Region

Suzuki, Yoshio; Takeuchi, Akihisa

doi:10.1143/jjap.51.086701

Cited by 4 publications

(3 citation statements)

References 24 publications

(38 reference statements)

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“…However, the conjugate images and reconstructed images overlap, a problem that must be solved. Hard X-rays have been used in Gabor holography [10], to obtain speckle-free coherent illumination [1][2][3][4][5][6][7][8][9][10][11], and in phase contrast microscopy [12]. Hard X-rays have also been used in coherent diffractive imaging [13] with high sensitivity, lens-less imaging with an extended source [14], and phase contrast imaging [15]-using polychromatic hard X-rays [16].…”

Section: Introductionmentioning

confidence: 99%

A microscope using Zernike’s phase contrast method and a hard x-ray Gabor hologram

Matsuda

Aguilar

Misawa

et al. 2016

J. Eur. Opt. Soc.-Rapid Publ.

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Background: In hard X-ray phase imaging using interferometry, the spatial resolution is limited by the pixel size of digital sensors, inhibiting its use in magnifying observation of a sample. Methods: To solve this problem, we describe a digital phase contrast microscope that uses Zernike's phase contrast method with a hard X-ray Gabor holography associated with numerical processing and spatial frequency domain filtering techniques. The hologram is reconstructed by a collimated beam in a computer. The hologram intensity distributions itself become the reconstructed wavefronts. For this transformation, the Rayleigh-Sommerfeld diffraction formula is used. Results: The hard X-ray wavelength 0.1259 nm (an energy of 9.85 keV) was employed at the SPring-8 facility. We succeeded in obtaining high-resolution images by a CCD sensor with a pixel size of 3.14 μm, even while bound by the need to satisfy the sampling theorem and by the CCD pixel size. The test samples used here were polystyrene beads of 8 μm, and human HeLa cells.

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Section: Introductionmentioning

confidence: 99%

A microscope using Zernike’s phase contrast method and a hard x-ray Gabor hologram

Matsuda

Aguilar

Misawa

et al. 2016

J. Eur. Opt. Soc.-Rapid Publ.

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“…The fine structures of the object are clearly reconstructed. The theoretical spatial resolution of reconstructed image is simply determined as /NA in the case of periodic structure [3], where  is wavelength, and NA is numerical aperture of hologram defined by sin. The  is half acceptance angle of hologram.…”

mentioning

confidence: 99%

“…The spatial resolution of traditional holography, Gabor holography with spherical wave and Fourier transform holography with point reference source, is essentially determined by the source size of spherical wave. The small x-ray reference sources are now usually made with modern x-ray focusing optics such as Fresnel zone plates [2,3]. An idea for making small virtual x-ray source is utilization of external total reflection of very short convex cylindrical mirrors, and the method is already applied to Gabor holography in the hard x-ray region [4].…”

mentioning

confidence: 99%

Generation of Virtual Point Source by Diffraction from Screen Edge as an X-ray Source for High-resolution Holography

Suzuki

Takeuchi

2018

Microsc Microanal

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X-ray holography [1] is one of the promising methods for high-resolution phase-contrast imaging. The spatial resolution of traditional holography, Gabor holography with spherical wave and Fourier transform holography with point reference source, is essentially determined by the source size of spherical wave. The small x-ray reference sources are now usually made with modern x-ray focusing optics such as Fresnel zone plates [2, 3]. An idea for making small virtual x-ray source is utilization of external total reflection of very short convex cylindrical mirrors, and the method is already applied to Gabor holography in the hard x-ray region [4]. A crossed waveguide optics [5] is also applied to hard x-ray beam confinement and holographic imaging. Here, we propose a method for generation of small virtual point source by combining two screen-edges, and its application to Gabor type holography is also described.

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Hard x-ray phase-contrast microscopy using a Gabor hologram without a zero-order term

et al. 2020

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In order to achieve a nanometer-scale resolution in an x-ray microscopy system, a Gabor-type hologram was produced by eliminating the zero-order term of the object diffraction pattern. In this system, a Fresnel zone plate was used for strong illumination of an object, and the zero-order diffraction was physically eliminated by a center stop. An accurate phase plate of π / 2 in the Zernike method was numerically created, and the phase-contrast image was realized. The theoretical resolution was 19.8 nm. We proved that a gold nanocube with a size of 50 nm can be reconstructed with the predicted resolution.

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Gabor Holography with Speckle-Free Spherical Wave in Hard X-ray Region

Cited by 4 publications

References 24 publications

A microscope using Zernike’s phase contrast method and a hard x-ray Gabor hologram

A microscope using Zernike’s phase contrast method and a hard x-ray Gabor hologram

Generation of Virtual Point Source by Diffraction from Screen Edge as an X-ray Source for High-resolution Holography

Hard x-ray phase-contrast microscopy using a Gabor hologram without a zero-order term

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