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Photonics
Special Issues
Holographic Optical Memory and Related Technologies
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Holographic Optical Memory and Related Technologies

A special issue of Photonics (ISSN 2304-6732).

Deadline for manuscript submissions: closed (15 May 2019) | Viewed by 9308

Special Issue Editor

Prof. Dr. Toyohiko Yatagai

E-Mail Website
Guest Editor
Center for Optical Research and Education (CORE), Utsunomiya University, Utsunomiya, Japan
Interests: holographic memory systems; holographic material; applications of holographic memory; 3D image display; optical information processing; optical measurement

Special Issue Information

Dear Colleagues,

Optical data storage has been increasingly drawing attention as one of the most important and indispensable technologies in information society. Moor’s Law is also valid in terms of data storage these decades. Optical memories store huge amounts of digitized data inexpensively and stably for very long periods of time. The conventional optical memories, like CD, DVD and Blu-ray Disc, are based on time serial recording and reading. This limits the access time. Holographic page data writing and reading technology could resolve these difficulties, yield the random access ability and conceivably increase data capacity. For more than four decades, researchers have challenged this dream technology. Very recently, a great deal of technical progress has made in holographic data storage systems.

This Special Issue is intended to contribute the technical grows in optical data storage. Original research articles related holographic memory, including holographic materials, spatial light modulators and high definition image sensors and related devices, as well as review articles and applications of holographic memory are welcome.

Prof. Toyohiko Yatagai
Guest Editor

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All submissions that pass pre-check are peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Photonics is an international peer-reviewed open access monthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 2400 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Keywords

  • holographic memory systems 
  • data multiplex in memory 
  • architectures for optical memory 
  • spatial light modulator 
  • image sensors for optical memory

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Published Papers (2 papers)

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Research

13 pages, 4146 KiB  
Article
Theoretical Study of a Surface Collinear Holographic Memory
by Soki Hirayama, Ryushi Fujimura, Shinsuke Umegaki, Yoshito Y. Tanaka and Tsutomu Shimura
Photonics 2019, 6(2), 70; https://doi.org/10.3390/photonics6020070 - 19 Jun 2019
Cited by 3 | Viewed by 4583
Abstract
Holographic memory is currently attracting attention as a data storage system capable of achieving a data transfer rate of about 105~106 times that of an optical disc such as Blu-ray disc. In conventional holographic memory, data is generally recorded by [...] Read more.
Holographic memory is currently attracting attention as a data storage system capable of achieving a data transfer rate of about 105~106 times that of an optical disc such as Blu-ray disc. In conventional holographic memory, data is generally recorded by optical writing using volume holograms. However, a volume hologram has the problem not only that it is required to have high mechanical accuracy of a system and low coefficient of thermal expansion of a recording medium, because reconstruction tolerance is extremely low, but also that duplicating time efficiency is poor because whole data cannot be recorded at once. In this paper we proposed surface holographic memory that achieved a high data transfer rate, stable readout performance, and collective duplication by expressing holograms with fine surface asperity. Furthermore, the theoretical formulas of recording and reconstruction processes in the proposed system were derived and the reconstruction characteristics of the hologram were evaluated by numerical simulation. As a result, the proposed method generated reconstructed image readout with sufficient signal for a single page recording. However, the reconstructed image had noise, which was particular to a surface holographic memory. Full article
(This article belongs to the Special Issue Holographic Optical Memory and Related Technologies)
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11 pages, 4689 KiB  
Article
Fabrication of Modified Random Phase Masks with Phase Modulation Elements Exhibiting Gaussian Profiles Using Molecular Migration under Photopolymerization
by Akira Emoto, Junya Honda, Kou Suzuki, Takumi Kimoto and Takashi Fukuda
Photonics 2019, 6(2), 62; https://doi.org/10.3390/photonics6020062 - 3 Jun 2019
Cited by 1 | Viewed by 4236
Abstract
Random phase masks are important technical elements for realizing holographic memory systems that enable high density recording. However, the broadly distributed Fourier spectrum often presents a problem because wide recording spots result in reduced total storage capacity for a recording medium. In the [...] Read more.
Random phase masks are important technical elements for realizing holographic memory systems that enable high density recording. However, the broadly distributed Fourier spectrum often presents a problem because wide recording spots result in reduced total storage capacity for a recording medium. In the present study, we propose modified random phase masks with phase modulation elements exhibiting Gaussian profiles to suppress the spread of the recording spot and keep it in a narrow area, based on the reduction of the high-frequency components in a random phase pattern. We confirm the effectiveness of the proposed random phase mask using simulations of a computer-generated binary hologram. However, issues still remain in terms of the fabrication of random phase masks with Gaussian profiles. Therefore, we evaluate the feasibility of fabricating the proposed random phase mask using molecular diffusion under photopolymerization. The results confirm the feasibility of this approach over a relatively wide area for actual fabrication. Full article
(This article belongs to the Special Issue Holographic Optical Memory and Related Technologies)
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