Holographic data storage using phase-only data pages

Tamás Sarkadi, Pál Koppa, Ferenc Ujhelyi, Reményi Judit Reményi, Gábor Erdei, Emó́ke Ló́rincz

Research output: Chapter in Book/Report/Conference proceedingConference contribution

3 Citations (Scopus)

Abstract

The application of phase-only input data pages has several advantages with respect to conventional amplitude modulated holographic storage: It avoids the saturation of the storage material by providing a smooth Fourier plane, improves the response in associative read-out, increases the light efficiency of the recording object wave and provides the opportunity of data encryption. However, if the information is carried by the phase of object wave front recovery of the data from the reconstructed beam is problematic with simple intensity sensitive devices as a CCD camera. To solve this problem we propose a compact phase to amplitude data page conversion method and apply it to the output of a Fourier holographic data storage system. The phase to amplitude conversion uses a birefringent crystal to generate two equal intensity copies of the reconstructed data page that are geometrically shifted by an integer number of pixels with respect to each other each other. The interference of these two phase modulated images is projected on the detector field of the camera. The interference pattern contains low and high intensity pixels if the phases of the interfering pixels are opposite and identical respectively. Using proper data coding, the original data matrix recovered from the intensity pattern of the CCD. Fourier plane homogeneity, bit error rate and positioning tolerances of the proposed holographic storage method are investigated by computer modeling and a comparison is provided with amplitude modulated data pages.

Original languageEnglish
Title of host publicationOptical and Digital Image Processing
DOIs
Publication statusPublished - Jul 28 2008
EventOptical and Digital Image Processing - Strasbourg, France
Duration: Apr 7 2008Apr 9 2008

Publication series

NameProceedings of SPIE - The International Society for Optical Engineering
Volume7000
ISSN (Print)0277-786X

Other

OtherOptical and Digital Image Processing
CountryFrance
CityStrasbourg
Period4/7/084/9/08

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Keywords

  • Birefringent
  • Data page
  • Data storage
  • Fourier
  • Hologram
  • Phase modulation

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Computer Science Applications
  • Applied Mathematics
  • Electrical and Electronic Engineering

Cite this

Sarkadi, T., Koppa, P., Ujhelyi, F., Judit Reményi, R., Erdei, G., & Ló́rincz, E. (2008). Holographic data storage using phase-only data pages. In Optical and Digital Image Processing [700004] (Proceedings of SPIE - The International Society for Optical Engineering; Vol. 7000). https://doi.org/10.1117/12.782258