&lt;title&gt;UV embossing process for multilayered waveguide holographic memory media&lt;/title&gt;

Ishihara, Kei; Kubo, Hideyuki; Yoshiyama, Ryuichi; Yamauchi, Koji; Kawashima, Masahiro; Miwa, Yasushi; Kobayashi, Toshihiro

doi:10.1117/12.453412

Cited by 6 publications

(4 citation statements)

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“…This in turn denotes that MWH can be applied to high-density optical data storage and holographic 3D moving images. [5][6][7][8][9] Although the requirement for stacking alignment depends on the application, it is rarely of the order of a wavelength because each layer is optically isolated. This relaxed alignment requirement releases this approach from the need to use two-beam exposure for recording holograms because the mechanical stacking, e.g., laminating, of embossed thinfilm holograms can satisfy the alignment requirement.…”

Section: Introductionmentioning

confidence: 99%

Pit Distribution Design for Computer-Generated Waveguide Holography

Yagi

Imai

Ueno

et al. 2008

jjap

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Multilayered waveguide holography (MWH) is one of a number of page-oriented data multiplexing holographies that will be applied to optical data storage and three-dimensional (3D) moving images. While conventional volumetric holography using photopolymer or photorefractive materials requires page-by-page light exposure for recording, MWH media can be made by employing stamping and laminating technologies that are suitable for mass production. This makes devising an economical mastering technique for replicating holograms a key issue. In this paper, we discuss an approach to pit distribution design that enables us to replace expensive electron beam mastering with economical laser beam mastering. We propose an algorithm that avoids the overlapping of even comparatively large adjacent pits when we employ laser beam mastering. We also compensate for the angular dependence of the diffraction power, which strongly depends on pit shape, by introducing an enhancement profile so that a diffracted image has uniform intensity.

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Section: Introductionmentioning

confidence: 99%

Pit Distribution Design for Computer-Generated Waveguide Holography

Yagi

Imai

Ueno

et al. 2008

jjap

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“…The orthogonal aperture-multiplexing (OAM) method [1][2][3] for fabricating a multilayered waveguide holographic (MWH) memory [1][2][3][4][5][6][7][8][9][10][11][12][13] has been studied to develop mass storage systems. For commercial systems, a modulation code is useful to reduce the raw bit error rate (BER), which is the BER before error-correction processing.…”

Section: Introductionmentioning

confidence: 99%

Two-Dimensional Constant-Weight Block Code in Orthogonal Aperture-Multiplexing for Multilayered Waveguide Holographic Memory

Ueno¹,

Endo²,

Kurokawa³

et al. 2008

jjap

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“…In this sense, the OAM may be categorized as an information density conversion technique. The OAM has been applied to multilayered waveguide holography, [3][4][5][6][7][8] in which a hologram consists of small pits with a distribution of approximately 0:5 Â 0:5 mm 2 in each waveguide layer. On the other hand, the pixel density of imaging devices is of the order of 5 Â 5 mm 2 .…”

Section: Introductionmentioning

confidence: 99%

Optical Design for Orthogonal Aperture-Multiplexed Waveguide Holography

Yagi

Nakamura

Imai

et al. 2007

jjap

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We study the level spacing distribution p(s) in the spectrum of random networks. According to our numerical results, the shape of p(s) in the Erdős-Rényi (E-R) random graph is determined by the average degree k and p(s) undergoes a dramatic change when k is varied around the critical point of the percolation transition, k = 1. When k 1, the p(s) is described by the statistics of the Gaussian orthogonal ensemble (GOE), one of the major statistical ensembles in Random Matrix Theory, whereas at k = 1 it follows the Poisson level spacing distribution. Closely above the critical point, p(s) can be described in terms of an intermediate distribution between Poisson and the GOE, the Brodydistribution. Furthermore, below the critical point p(s) can be given with the help of the regularized Gamma-function. Motivated by these results, we analyse the behaviour of p(s) in real networks such as the internet, a word association network and a protein-protein interaction network as well. When the giant component of these networks is destroyed in a node deletion process simulating the networks subjected to intentional attack, their level spacing distribution undergoes a similar transition to that of the E-R graph.

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<title>UV embossing process for multilayered waveguide holographic memory media</title>

Cited by 6 publications

References 0 publications

Pit Distribution Design for Computer-Generated Waveguide Holography

Pit Distribution Design for Computer-Generated Waveguide Holography

Two-Dimensional Constant-Weight Block Code in Orthogonal Aperture-Multiplexing for Multilayered Waveguide Holographic Memory

Optical Design for Orthogonal Aperture-Multiplexed Waveguide Holography

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