title: Two-dimensional ultrahigh-density X-ray optical memory.
abstract: Most important aspect of nanotechnology applications in the information ultrahigh storage is the miniaturization of data carrier elements of the storage media with emphasis on the long-term stability. Proposed two-dimensional ultrahigh-density X-ray optical memory, named X-ROM, with long-term stability is an information carrier basically destined for digital data archiving. X-ROM is a semiconductor wafer, in which the high-reflectivity nanosized X-ray mirrors are embedded. Data are encoded due to certain positions of the mirrors. Ultrahigh-density data recording procedure can e.g., be performed via mask-less zone-plate-array lithography (ZPAL), spatial-phase-locked electron-beam lithography (SPLEBL), or focused ion-beam lithography (FIB). X-ROM manufactured by nanolithography technique is a write-once memory useful for terabit-scale memory applications, if the surface area of the smallest recording pits is less than 100 nm2. In this case the X-ROM surface-storage capacity of a square centimetre becomes by two orders of magnitude higher than the volumetric data density really achieved for three-dimensional optical data storage medium. Digital data read-out procedure from proposed X-ROM can e.g., be performed via glancing-angle incident X-ray micro beam (GIX) using the well-developed X-ray reflectometry technique. In presented theoretical paper the crystal-analyser operating like an image magnifier is added to the set-up of X-ROM data handling system for the purpose analogous to case of application the higher numerical aperture objective in optical data read-out system. We also propose the set-up of the X-ROM readout system based on more the one incident X-ray micro beam. Presented scheme of two-beam data handling system, which operates on two mutually perpendicular well-collimated monochromatic incident X-ray micro beams, essentially increases the reliability of the digital information read-out procedure. According the graphs of characteristic functions presented in paper, one may choose optimally the incident radiation wavelength, as well as the angle of incidence of X-ray micro beams, appropriate for proposed digital data read-out procedure.
authors: Department of Solid State Physics, Yerevan State University, Yerevan City, AM 375025, Republic of Armenia.
authors: Hakob P
authors: HP
authors: Bezirganyan
authors: Siranush E
authors: SE
authors: Bezirganyan
authors: Hayk H
authors: HH
authors: Bezirganyan
authors: Petros H
authors: PH
authors: Bezirganyan
mesh_terms: D016248:Computer Storage Devices; D003201:Computers; D004563:Electrochemistry / Q000379:methods; D004583:Electrons; D016247:Information Storage and Retrieval; D008962:Models, Theoretical; D036103:Nanotechnology / Q000379:methods*; D012666:Semiconductors; D012815:Signal Processing, Computer-Assisted; D012984:Software; D014961:X-Ray Diffraction; D014965:X-Rays