Paper is devoted to further evolution of the concept of ultra-high density hard x-ray storage media - a radically new x-ray-
based optical data storage nanotechnology with terabit-scale digital data density per square centimeter of each
storage layer of the memory disk. Forthcoming hard x-ray optical data read-out devices will use an ultra-high density
information carrier named x-ray optical memory (X-ROM), which consists of crystalline wafer with the generated sub-surface
amorphous nanometer-size reflecting speckles of x-ray high-reflectivity material. X-ROM is designed for long-term
archiving of the large volumes of information and digital data handling via read-out systems operating on x-ray
wavelength optics. Digital data read-out procedure from X-ROM is performed via grazing-angle incident x-ray micro
beam. X-ray-based optical data storage system detects data by measuring changes in x-ray micro beam intensity reflected
from the various surface points of data storage media. Grazing-angle incident x-ray configuration allows the handling of
data from very large surface area of X-ROM disk and, consequently, the data read-out speed is much faster than in
optical data read-out systems. Aim of paper is detailed evaluation of storage data-layer's effective thickness best fitted
for a digital data read-out procedure. Penetration depths of non-homogeneous x-ray wave fields inside crystalline
substrate and amorphous speckles of X-ROM are investigated theoretically in case of grazing-angle incidence x-ray
backscattering diffraction (GIXB) applied in specular beam suppression mode. It is possible to reduce the effective
thickness of data storage layer to a value of less than a single-bit linear size i.e. to reduce effective thickness up to 10 nm,
according to performed evaluations.
We present in this theoretical paper a set-up of grazing-angle incidence hard x-ray nanoscope (GIXN), which is the essential part of ultra-high density digital data read-out device. The GIXN consists of the asymmetrically cut single crystal, which is operating like an image magnifier. The X-ray high-resolution diffractive optical lens (zone plate) and spatially resolving detector (CCD camera) are arranged like in classical schemes of the X-ray imaging microscopy.
Proposed nanoscope operates based on grazing-angle incidence x-ray backscattering diffraction (GIXB) technique applied in the specular beam suppression mode. Grazing-angle incident X-ray configuration allows the handling of data from very large surface area of the X-ray optical memory disk (X-ROM) and, consequently, the data read-out speed is much faster than in optical data read-out systems.
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