Research ArticleDATA STORAGE

Three-dimensional supercritical resolved light-induced magnetic holography

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Science Advances  13 Oct 2017:
Vol. 3, no. 10, e1701398
DOI: 10.1126/sciadv.1701398
  • Fig. 1 Single 3D super-resolved longitudinal MS.

    (A) The overall magnetization distribution in the RZ plane. (B) Magnetization components in the lateral direction [horizontal white dashed line in (A)]. a.u., arbitrary units. (C) Magnetization components in the axial direction [vertical white dashed line in (A)]. (D) 3D slices of MS along the z axis.

  • Fig. 2 The 3D super-resolved pyramidal MS array in the magnetic hologram.

    (A) The phase pattern of MPSs for the pyramidal pattern. (B) The 3D spatial pyramid MSs arrangement. (C) The cross-sectional map of 3D MS array in the plane ABCD. (D) The cross-sectional map of 3D MS array in the plane EGCA.

  • Fig. 3 The magnetization reversal in the pyramid.

    (A and D) Schematics of one-spot and three-spot reversal, with arrows indicating their respective magnetization directions. (B and E) The cross-sectional maps of 3D MS array in the plane ABCD after reversal. (C and F) The cross-sectional maps of 3D MS array in the plane EGCA after reversal.

  • Fig. 4 Illustration for identity verification.

    The linearly polarized light is incident perpendicular to the magnetic hologram on the magnetic array. The QR codes of the NUS website and logo are recorded in the same layer with logic bits “1” and “0,” respectively. When the rotation-mounted polarizer is rotated to the position of the triangle, the QR code of the NUS website link is reconstructed. Similarly, the logo of NUS will be reconstructed by rotating the polarizer to the position of the hexagram.

  • Fig. 5 Optical scheme for achieving super-resolved MS.

    (A) Schematic of the 4π beam combination microscopic system integrated with MPFs encoded by spatial light modulators (SLMs). The light wavelength is 800 nm. Six coherent beams are first combined and then focused to the magnetic hologram (an isotropic MO medium) located at the focal plane of the proposed system. OBJ, objective (oil-immersed lens; NA, 1.43); BS, beam splitter; PM, pellicle mirror; M, mirror. (B) The recording process of the magnetic hologram. The magnetic hologram is longitudinally magnetized because of the inverse Faraday effect. Zone ① is the postrecording zone, zone ② is the zone in recording process, and zone ③ is the zone prerecording. (C) Schematic of magnetization reversal. Positive MSs with blue arrows are induced by left-hand circularly polarized light, and negative MSs with red arrows are induced by right-hand circularly polarized light.

Supplementary Materials

  • Supplementary material for this article is available at http://advances.sciencemag.org/cgi/content/full/3/10/e1701398/DC1

    Supplementary Text

    fig. S1. The lateral spot size as a function of NA under a circularly polarized light illumination.

    fig. S2. The logo of NUS in the focal region.

    table S1. Optimized parameters (αi and Ci) for supercritical MS generation.

    table S2. Performance comparison: CPU computing versus GPU parallel computing.

    References (4750)

  • Supplementary Materials

    This PDF file includes:

    • Supplementary Text
    • fig. S1. The lateral spot size as a function of NA under a circularly polarized light illumination.
    • fig. S2. The logo of NUS in the focal region.
    • table S1. Optimized parameters (αi and Ci) for supercritical MS generation.
    • table S2. Performance comparison: CPU computing versus GPU parallel computing.
    • References (47–50)

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