Analysis of Multiplexed Holograms Recording by Using a Two-Dimensional Beam Propagation Method

Yoshida, Shuhei; Saitoh, M.; Yoshida, Naruki; Yamamoto, Masaaki

doi:10.1109/tmag.2009.2016273

Cited by 4 publications

(3 citation statements)

References 14 publications

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“…In holographic memory, multiple recording is an important technique for achieving high recording density. Several multiplexing techniques are proposed, such as shift multiplexing, angular multiplexing, and phase multiplexing [8,[40][41][42][43][44][45][46][47][48][49][50][51][52][53][54][55][56][57]. Nakamura et al reported the results of shift multiplexing recorded on the magnetic garnet film in collinear magnetic holograms [24].…”

Section: Multiplexitymentioning

confidence: 99%

Magnetic Holography and Its Application to Data Storage

Nakamura

2021

Photonics

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The principle of magnetic holograms and its application to holographic memory are reviewed. A magnetic hologram was recorded through a thermomagnetic recording as a difference in magnetization direction and reconstructed with the magneto-optical effect. To achieve a bright reconstruction image, it is important to record deep magnetic fringes on the materials with large Faraday rotation coefficients. This technique was applied to the holographic memory using transparent magnetic garnets as a recording material. The first reconstruction image was dark and noisy, but improvements in the recording conditions resulted in error-free recording and reconstruction of the magnetic hologram. To form deep magnetic fringes, insertion of heat dissipation (HD) layers into recording layer was proposed. It was found that this HD multilayer medium showed diffraction efficiency higher than that of a single layer medium, and error-free recording and reconstruction were also achieved, using magnetic assisted recording. These results suggest that HD multilayer media have potential applications in recording media of magnetic holographic data storage. In future, a high recording density technique, such as multiple recording, should be developed.

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Section: Multiplexitymentioning

confidence: 99%

Magnetic Holography and Its Application to Data Storage

Nakamura

2021

Photonics

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“…Techniques for analyzing volume holograms include the finite-difference time-domain (FDTD) method 18,19) and the beam propagation method (BPM), [20][21][22][23][24] which are based on the finite differentiation of Maxwell's equations. Using these techniques, we can readily set the shape of the hologram, which makes these methods applicable to various problems.…”

Section: Numerical Analysismentioning

confidence: 99%

High-Density Holographic Data Storage Using Three-Dimensional Shift Multiplexing with Spherical Reference Wave

Yoshida

Kurata

Ozawa

et al. 2013

Jpn. J. Appl. Phys.

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In this study, we propose a three-dimensional shift multiplexing technique using a spherical reference wave. By utilizing a spherical reference wave, multiplex recording is enabled in this system by simply displacing the recording medium. The utilization of a spherical reference wave makes it possible to realize three-dimensional multiplexing, which uses parallel directions of the medium surface and thickness direction. It is also expected that this approach will improve the recording density as compared with the conventional multiplex technique. We report the numerical and experimental evaluation results of our high-density recording and reproduction system based on this principle.

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“…We simulated the formation of the holographic grating based on the two-dimensional interdiffusion model and used the beam propagation method (BPM) [16] to analyze the diffraction characteristics. Based on previous works [17,18], BPM is considered effective for analyzing diffraction characteristics. By using BPM, we can analyze the diffraction characteristics of the complex holographic grating.…”

Section: Introductionmentioning

confidence: 99%

Numerical Model of Radical Photopolymerization Based on Interdiffusion

Yoshida

Takahata

Horiuchi

et al. 2014

International Journal of Polymer Science

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An accurate reaction model is required to analyze the characteristics of photopolymers. For this purpose, we propose a numerical model for radical photopolymerization. In the proposed model, elementary reactions such as initiation, propagation, and termination are considered, and we assume interdiffusion for each component in the material. We analyzed the diffraction characteristics of a radical photopolymer based on the proposed interdiffusion model with the beam propagation method. Moreover, we also performed hologram-recording experiments and evaluated the diffraction characteristics of the photopolymer medium. By comparing the numerical and experimental results, medium parameters such as reaction rate and diffusion coefficient can be estimated. We confirmed that the interdiffusion model can reproduce the experimental results and showed that the medium parameters affect the diffraction characteristics.

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Analysis of Multiplexed Holograms Recording by Using a Two-Dimensional Beam Propagation Method

Cited by 4 publications

References 14 publications

Magnetic Holography and Its Application to Data Storage

Magnetic Holography and Its Application to Data Storage

High-Density Holographic Data Storage Using Three-Dimensional Shift Multiplexing with Spherical Reference Wave

Numerical Model of Radical Photopolymerization Based on Interdiffusion

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