High-density disk storage by multiplexed microholograms

Eichler, H. J.; Kuemmel, Peter; Orlic, Susanna; Wappelt, A.

doi:10.1109/2944.735770

Cited by 93 publications

(44 citation statements)

References 17 publications

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“…On the other hand, single bits are recorded in DVD systems having projected data rates of a few hundred megabits per second; not too far from the 500 Mb/s required for follow-on systems. There is, therefore, an opportunity to use holography with very small page sizes (or even single-bit holograms), as has been researched by Eichler in Germany and Siros Technologies in the United States, among others [141], [142], and earlier at IBM. [143].…”

Section: Discussionmentioning

confidence: 99%

“…Data are stored by interfering two counterpropagating focused object and reference laser beams, as schematically shown in Fig. 79, as reported by [141].…”

Section: N Single-bit Holographic Storagementioning

confidence: 99%

“…By combining wavelength, angle multiplexing, and depth multiplexing (i.e., recording holograms at different depth locations), total storage capacity is equal to (55) where denotes the number of layers, represents the number of wavelength-multiplexed holograms, is the number of angle-multiplexed holograms, and represents the surface bit density. A capacity of 100 GB is, in principle, achievable using two layers, ten wavelengths and 16 different angles for multiplexing a total of 160 holograms per location, using a bit spot size of 1 m radius [141]. A widely tunable laser is needed, as the wavelength selectivity is relatively small, requiring tens of micrometers of wavelength separation between multiplexed holograms.…”

Section: N Single-bit Holographic Storagementioning

confidence: 99%

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Holographic data storage systems

Hesselink¹,

Orlov²,

2004

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Section: Discussionmentioning

confidence: 99%

“…Data are stored by interfering two counterpropagating focused object and reference laser beams, as schematically shown in Fig. 79, as reported by [141].…”

Section: N Single-bit Holographic Storagementioning

confidence: 99%

Section: N Single-bit Holographic Storagementioning

confidence: 99%

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Holographic data storage systems

Hesselink¹,

Orlov²,

2004

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“…A micro holographic storage system (MHSS) is one of the best candidates for next-generation high density optical memories [1,2]. Data bits are represented by microscopic-size holograms formed by the interference of two tightly focused counter-propagating beams, with each bit consuming a small amount of the entire volume [3,4].…”

Section: Introductionmentioning

confidence: 99%

Diffraction Focal Position and Vector Diffraction Theory for Micro Holographic Storage Systems

et al. 2014

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Abstract:In this study, we proposed a method to determine the optimal focal position for micro-holographic storage systems, using vector diffraction theory; the theory provides exact solutions when the numerical aperture (NA) exceeds 0.6. The best diffraction focus was determined by the position and wavelength corresponding to minimal spherical aberration. The calculated refractive index modulation, polarization illumination, and boundary conditions at the interface of different media were analyzed. From the results of our analysis, we could confirm the size of micrograting as a function of NA and wavelength, based on vector diffraction theory, compared with scalar diffraction theory which defines the micrograting by . To demonstrate our analysis, we adapted an optical alignment method using a Twyman-Green interferometer, and could obtain good agreement between analysis and experimental results.

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“…A method using a micro-hologram is one of such technologies [1,2], where a micro-hologram is generated as a set of interference fringes when two counterpropagating focused laser beams intersect at the focus. The data that one of the two lights, namely object light, carries are reconstructed as diffraction from the hologram when the other light called the reference light is illuminated on the hologram.…”

Section: Introductionmentioning

confidence: 99%

Finite element computation for scattering problems of micro-hologram using DtN map

Mizuyama

Shinde²,

Tabata

et al. 2010

JSIAM Letters

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Computational results are presented on micro-hologram diffraction for optical data storage using a finite element method. Retrieval of object light from a micro-hologram is formulated as an optical scattering problem in an infinite region. In order to overcome the difficulty of dealing with the infinite region a Dirichlet to Neumann (DtN) map is employed on an artificial boundary. By virtue of the DtN map reflection from the artificial boundary is effectively alleviated and non-reflecting boundary is obtained. Retrieval of the object light is computed for two different models.

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High-density disk storage by multiplexed microholograms

Cited by 93 publications

References 17 publications

Holographic data storage systems

Holographic data storage systems

Diffraction Focal Position and Vector Diffraction Theory for Micro Holographic Storage Systems

Finite element computation for scattering problems of micro-hologram using DtN map

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