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Proceedings Paper

The design of ROM-type holographic memory with iterative Fourier transform algorithm
Author(s): Hideki Akamatsu; Kai Yamada; Noriyuki Unno; Shuhei Yoshida; Jun Taniguchi; Manabu Yamamoto
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Paper Abstract

The research and development of the holographic data storage (HDS) is advanced, as one of the high-speed, mass storage systems of the next generation. Recently, along the development of the write-once system that uses photopolymer media, large capacity ROM type HDS which can replace conventional optical discs becomes important. In this study, we develop the ROM type HDS using a diffractive optical element (DOE), and verify the effectiveness of our approach. In order to design DOE, iterative Fourier transform algorithm was adopted, and DOE is fabricated with electron beam (EB) cutting and nanoimprint lithography. We optimize the phase distribution of the hologram by iterative Fourier transform algorithm known as Gerchberg–Saxton (GS) algorithm with the angular spectrum method. In the fabrication process, the phase distribution of the hologram is implicated as the concavity and convexity structure by the EB cutting and transcribed with nanoimprint lithography. At this time, the mold is formed as multiple-stage concavity and convexity. The purpose of multiple-stage concavity and convexity is to obtain high diffraction efficiency and signal-to-noise ratio (SNR). Fabricated trial model DOE is evaluated by the experiment.

Paper Details

Date Published: 1 March 2013
PDF: 8 pages
Proc. SPIE 8644, Practical Holography XXVII: Materials and Applications, 86440Z (1 March 2013); doi: 10.1117/12.2002309
Show Author Affiliations
Hideki Akamatsu, Tokyo Univ. of Science (Japan)
Kai Yamada, Tokyo Univ. of Science (Japan)
Noriyuki Unno, Tokyo Univ. of Science (Japan)
Shuhei Yoshida, Tokyo Univ. of Science (Japan)
Jun Taniguchi, Tokyo Univ. of Science (Japan)
Manabu Yamamoto, Tokyo Univ. of Science (Japan)

Published in SPIE Proceedings Vol. 8644:
Practical Holography XXVII: Materials and Applications
Hans I. Bjelkhagen; V. Michael Bove Jr., Editor(s)

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