&lt;title&gt;High-density disc storage by multiplexed microholograms&lt;/title&gt;

Eichler, Hans Joachim; Diez, Stefan; Elschner, Robert; Macdonald, Rainer; Schulz, R.; Wappelt, A.

doi:10.1117/12.280698

Cited by 3 publications

(2 citation statements)

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“…A microholographic system, [1][2][3][4][5][6] among various volumetric recording systems, is bit-based holographic data storage (HDS). In the microholographic system, diffraction-limit sized, elongated reflection holograms along the optical axis, namely microholograms, are stored on virtual layers in a transparent holographic medium by the interference of two coherent, counter-propagating focused light beams (signal and reference beams).…”

Section: Introductionmentioning

confidence: 99%

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Analysis of Phase Multilevel Recording on Microholograms

Ide¹,

Mikami²,

Osawa³

et al. 2011

Jpn. J. Appl. Phys.

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An optical phase multilevel recording technique using a microholographic system and phase-diversity homodyne detection for enhancement of optical disc capacity is investigated. In this technique, multilevel phase signals are stored as the fringe shifts along the optical axis and recovered from the arctangent of two homodyne-detected signals. For comparison, phase signals from Blu-ray Disc read-only memory (BD-ROM) and Blu-ray Disc recordable (BD-R) media obtained by phase-diversity homodyne detection are experimentally evaluated. From the experimental results, we demonstrated that phase-diversity homodyne detection is useful for detecting the phase signal modulation of the signal beam from an optical disc. Furthermore, simulation results on microholograms indicate that phase signals from the microholograms are much more stable despite the variety of their sizes than those from BD-ROM. These results demonstrate the potential of this multilevel recording method.

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Section: Introductionmentioning

confidence: 99%

“…One way to obtain a higher capacity in the microholographic system is the use of a multiplexing scheme including wavelength and angle multiplexing. 1,6) However, such a scheme will complicate the optical system and might diminish the strength of the microholographic system.…”

Section: Introductionmentioning

confidence: 99%