Production of Reflection Point Sources for Hard X-Ray Gabor Holography

Abstract

The production of point X-ray sources for hard X-rays of approximately 8 keV is proposed and their application to Gabor holography is examined. Small X-ray sources less than 100 nm in diameter are obtained by total reflection from a limited surface area at grazing incidence. A microstrip plated with heavy metal on a glass plate is used for a one-dimensional small X-ray source and crossed glass rods for a two-dimensional X-ray source. A virtual source width smaller than approximately 80 nm is demonstrated. Young's X-ray interference fringes are obtained using beams reflected from two microstrips. Gabor X-ray holograms of a gold wire and a diatom are recorded with a virtual point source and their reconstructed images are numerically obtained.

New x-ray nanofocusing devices based on total-reflection zone plates

“…When a reflective pattern on a flat surface is irradiated by x-rays that satisfy the total reflection condition, the size of the observed pattern becomes increasingly compressed in the glancing direction as the glancing angle is reduced. This size reduction effect is useful for generating point sources in the hard x-ray region and it is applied in projection holography and Young interferometers 21,22 . TRZP utilizes this effect for focusing hard x-rays.…”

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

“…Since the beginning of X-ray holography, Gabor-type holography has been widely used in the hard X-ray region. Although the characteristic X-ray beam from a fine-focus X-ray tube is firstly used as a coherent X-ray wave for X-ray Gabor holography, 2) high brilliant synchrotron radiation X-ray sources are now used for holographic imaging, [3][4][5][6][7][8][9][10][11] including Fourier transform holography. [12][13][14][15][16][17] Recently, a free electron laser source has been applied to Gabor-type holography in the VUV and soft X-ray regions.…”

“…[3][4][5] The other is the use of a point focus beam with beam focusing optics or the use of a pseudo-point source defined by a pinhole, e.g., Gabor-type holography with a spherical wave. 6,7,9,10,[16][17][18] In both cases, one of the important techniques for holographic imaging is the generation of a speckle-free (clean and uniform) beam, because, in holographic imaging, speckle noises cannot be erased by a flat-field correction technique. Speckles always yield serious noises and artifacts in reconstructed images and the image quality of holography is generally limited by speckle noises.…”

A monolithic Fresnel bimirror for hard X-rays and its application for coherence measurements

“…Another approach, i.e. creating narrow slits of micrometre size, was published recently by Aoki et al (2005). There the reflection of X-rays at thin gold stripes coated on a flat surface was investigated.…”