Realization of high-performance holographic data storage: the InPhase Technologies demonstration platform

Wilson, William L.; Curtis, Kevin; Anderson, Kent; Tackitt, Michael; Hill, Adrian; Pane, M.; Stanhope, C.; Earhart, T.; Loechel, W.; Bergman, C.; K., Wolfgang; Shuman, C. A.; Hertrich, G.; Pharris, K.; Malang, Keith; Riley, B.; Ayres, Mark

doi:10.1117/12.506055

Cited by 23 publications

(16 citation statements)

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“…Normally, these materials are used in holographic applications, where high values of spatial frequencies are recorded. In this range of frequencies many processes are involved in the hologram formation, such as species diffusion, nonlocal polymerization (due to the finite size of polymer chains), and shrinkage or swelling (volume changes) [1][2][3][4][5][6][7][8]. In this sense, the variations in the estimation of the monomer diffusion affect significantly the values obtained for other material parameters, making it difficult to calculate them separately.…”

Section: Introductionmentioning

confidence: 99%

Analysis of PVA/AA based photopolymers at the zero spatial frequency limit using interferometric methods

et al. 2008

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One of the problems associated with photopolymers as optical recording media is the thickness variation during the recording process. Different values of shrinkages or swelling are reported in the literature for photopolymers. Furthermore, these variations depend on the spatial frequencies of the gratings stored in the materials. Thickness variations can be measured using different methods: studying the deviation from the Bragg's angle for nonslanted gratings, using MicroXAM S/N 8038 interferometer, or by the thermomechanical analysis experiments. In a previous paper, we began the characterization of the properties of a polyvinyl alcohol/acrylamide based photopolymer at the lowest end of recorded spatial frequencies. In this work, we continue analyzing the thickness variations of these materials using a reflection interferometer. With this technique we are able to obtain the variations of the layers refractive index and, therefore, a direct estimation of the polymer refractive index.

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Section: Introductionmentioning

confidence: 99%

Analysis of PVA/AA based photopolymers at the zero spatial frequency limit using interferometric methods

et al. 2008

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“…Photopolymer applications include grating couplers [7], focusing gratings [8], optical interconnects [9], optical data storage [10], holographic filters [11], acoustooptical deflectors and acoustooptical modulators [12], since these materials have several attractive advantages. In recent years there has been an increase in holographic data storage applications and new companies have developed photopolymer disks for information storage [10,[13][14][15][16][17][18][19]. In order to achieve high capacity holographic memories the thickness of the material must be 500 µm or more.…”

Section: Introductionmentioning

confidence: 99%

3-dimensional characterization of thick grating formation in PVA/AA based photopolymer

et al. 2006

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Large thickness is required in holographic recording materials to be used as holographic memories. Photopolymers have proved to be a good alternative to construct holographic memories. Nevertheless, modeling the behavior of thick layers poses some problems due to high absorption of the dye, as discussed in previous papers. In this study, the gratings stored in photopolymers based on polyvinylalcohol/acrylamide (PVA/AA) are analyzed considering the attenuation of light in depth. This is done by fitting the theoretical results, predicted by a model that considers this effect, to the experimental results obtained using diffraction gratings recorded in PVA/AA based photopolymer. In order to determine the diffraction efficiency at the first Bragg angle, an algorithm based on the rigorous coupled wave theory is used. Also, the characteristics of the gratings obtained using different recording intensities are analyzed, and the effective optical thickness is seen to increase as the intensity is increased.

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“…Photopolymer materials exhibit good optical properties (low losses, low scatter, high refractive index modulations and high density information storage) and are relatively inexpensive. Due to these reasons, some companies have presented the first holographic disks based on photopolymers [4][5]. One of the requirements to obtain competitive holographic memories is that the material must have a thickness of 500 μ m or more [6].…”

Section: Introductionmentioning

confidence: 99%

Improved maximum uniformity and capacity of multiple holograms recorded in absorbent photopolymers

Gallego¹,

Ortuño²,

Neipp³

et al. 2007

Opt. Express

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Abstract:In order to use photopolymers in the recording of holographic memories, high physical thickness is required. This generates many problems associated with the attenuation of light in the recording due to Beer's law. One of the more significant disadvantages is the fact that there are differences between the physical thickness of the material and the optical thickness of the holograms recorded. The optical thickness characterizes the angular selectivity of the holograms and determines the separation between two consecutive holograms in angular peristrophic multiplexing. In this work we propose a new method to record many holograms multiplexed with similar diffraction efficiency values taking into account the different effective optical thickness of each hologram.

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Realization of high-performance holographic data storage: the InPhase Technologies demonstration platform

Cited by 23 publications

References 0 publications

Analysis of PVA/AA based photopolymers at the zero spatial frequency limit using interferometric methods

Analysis of PVA/AA based photopolymers at the zero spatial frequency limit using interferometric methods

3-dimensional characterization of thick grating formation in PVA/AA based photopolymer

Improved maximum uniformity and capacity of multiple holograms recorded in absorbent photopolymers

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