Interlayer crosstalk reduction of a multilayer Blu-ray Disc using a grating in a three beam optical system

Ide, Tomohiro; Kimura, S.; Tatsu, Eriko; Kurokawa, Tetsuji; Watanabe, Keiji; Anzai, Yumiko; Shintani, Toshimichi

doi:10.1364/ao.49.002309

Cited by 8 publications

(3 citation statements)

References 6 publications

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“…Additionally, homodyne detection seems to separate sum signals from a dual-layer disc having a spacing of less than 5 m. These results show that homodyne detection reduces interlayer crosstalk and has the potential to be a powerful tool to recover data from multilayer discs having extremely narrow layer spacings of less than 10 m. Finally, Fig. 10 shows the experimental results using a triple-layer BD whose layer spacings were 14 and 18 m. 26) Even in this experiment, sum signals obtained by phasediversity homodyne detection were easy to distinguish. These results demonstrate that homodyne detection also has higher tolerance to interlayer crosstalk for multilayer discs having more than three layers.…”

Section: Resultsmentioning

confidence: 79%

Reduction of Interlayer Crosstalk of Multilayer Optical Disc by Using Phase-Diversity Homodyne Detection

Ide

Osawa

Mikami

et al. 2012

Jpn. J. Appl. Phys.

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Scatter correction techniques in iterative positron emission tomography (PET) reconstruction increasingly utilize Monte Carlo (MC) simulations which are very well suited to model scatter in the inhomogeneous patient. Due to memory constraints the results of these simulations are not stored in the system matrix, but added or subtracted as a constant term or recalculated in the projector at each iteration. This implies that scatter is not considered in the back-projector. The presented scheme provides a method to store the simulated Monte Carlo scatter in a compressed scatter system matrix. The compression is based on parametrization and B-spline approximation and allows the formation of the scatter matrix based on low statistics simulations. The compression as well as the retrieval of the matrix elements are parallelizable. It is shown that the proposed compression scheme provides sufficient compression so that the storage in memory of a scatter system matrix for a 3D scanner is feasible. Scatter matrices of two different 2D scanner geometries were compressed and used for reconstruction as a proof of concept. Compression ratios of 0.1% could be achieved and scatter induced artifacts in the images were successfully reduced by using the compressed matrices in the reconstruction algorithm.

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Section: Resultsmentioning

confidence: 79%

Reduction of Interlayer Crosstalk of Multilayer Optical Disc by Using Phase-Diversity Homodyne Detection

Ide

Osawa

Mikami

et al. 2012

Jpn. J. Appl. Phys.

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“…Axial multi-focus beams (AMBs) offer a broad range of applications, and is being applied in numerous scientific and industrial fields. Particularly interesting applications for such beams are reading in multi-layered peptide array system [1], optical trapping [2], [3], intraocular lenses [4]- [6], micromanipulation [7], [8] and multi-layer optical disc storage [9] in general. Such beams are attractive not only because of their multi-focus properties but also we can modulate the beam parameters.…”

Section: Introductionmentioning

confidence: 99%

Axial Multifocus Beams Formed by Binary Optical Elements

Xiao

Kong

et al. 2019

IEEE Photonics J.

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Axial multifocus beams (AMBs) potentially offer convenience in scientific and industrial applications. However, the general approach used for forming AMBs based on the Fresnel zone plate limits the conceivable applications. In this paper, we introduce a custom-made method to generate AMBs by the point source method to obtain initial phase distribution and a modified Gerchberg-Saxton algorithm to iteratively optimize the phase distribution. Meanwhile, the sidelobe is also constrained in the design simultaneously. Here, foci numbers, positions, and intensity distributions of the AMBs have been designed by binary optical elements, which can be controlled readily and effectively. Both numerical simulations and experiment results show the validity of the proposed method.

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“…When one uses a multilayered technique in an overall optical memory, it gives rise to crosstalk noises along the thickness direction named as interlayer crosstalk. 11) Then, interlayer crosstalk deteriorates reconstructed signals significantly. For this reason, we introduce the MRPM into our proposed method to remove interlayer crosstalk.…”

Section: Introductionmentioning

confidence: 99%

Multilayer Collinear Holographic Memory with Movable Random Phase Mask

Shibukawa

Okamoto

Tomita

et al. 2011

Jpn. J. Appl. Phys.

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We proposed a new multilayer collinear holographic memory (MCHM) with a movable random phase mask that can act as an interlayer crosstalk reducer. First, to clarify the feasibility of our proposed device, we showed that it has an extremely sharp shift selectivity along the thickness direction of medium of nearly 5.0 µm when the numerical aperture of the objective lens is 0.60. Next, we demonstrated that the utilization of the movable random phase mask can suppress interlayer crosstalk sufficiently, resulting in the improvement in the quality of reconstructed signals. Moreover, we revealed that the MCHM, in which the parallel use of a multilayered technique and collinear shift multiplexing is performed, brings out the medium potential sufficiently in terms of signal to noise ratio and medium dynamic range consumption. Finally, we verified that the MCHM can achieve a nearly 2 times larger data density at least compared with a conventional collinear holographic memory.

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Interlayer crosstalk reduction of a multilayer Blu-ray Disc using a grating in a three beam optical system

Cited by 8 publications

References 6 publications

Reduction of Interlayer Crosstalk of Multilayer Optical Disc by Using Phase-Diversity Homodyne Detection

Reduction of Interlayer Crosstalk of Multilayer Optical Disc by Using Phase-Diversity Homodyne Detection

Axial Multifocus Beams Formed by Binary Optical Elements

Multilayer Collinear Holographic Memory with Movable Random Phase Mask

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