Numerical evaluation of angular multiplexing in reflection-type holographic data storage in photopolymer with shrinkage

Yonetani, Yusuke; Nitta, Katsumi; Matoba, Osamu

doi:10.1364/ao.49.000694

Cited by 18 publications

(12 citation statements)

References 12 publications

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“…It is interesting to note that this phenomenon is very important in the case of reflection gratings due to the high number of interference fringes. From equation (4), the maximum DEmax is obtained at the Bragg condition (in which the parameter ξ is 0). In this point, DE is dominated by parameter ν, which depends on the product Δn•d.…”

Section: Resultsmentioning

confidence: 99%

“…The experimental transmission values as a function of the wavelength can be fitted by means of efficient transmission (TE) relation of Kogelnik's Coupled wave theory [equation (4)]. The optical thickness (d), Δn, Λ, n, absorption loss coefficient (α) and fringe tip angles (φ) were obtained.…”

Section: Analysis Of Experimental Data Through Kogelnik's Coupled Wavmentioning

confidence: 99%

“…Reflection holographic gratings have great interest due to the demand for materials with enough resolution for high spatial frequencies recording. The reflection holograms have been employed for holography display 1,2 , optical data storage and three-dimensional multiplexing to improve the data storage density 3,4 . One of the main advantages of reflection holograms is that they can be reconstructed using white light.…”

Section: Introductionmentioning

confidence: 99%

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Reflection holograms stored in an environment-friendly photopolymer

Ramírez

Sirvent

Ortuño

et al. 2019

Holography: Advances and Modern Trends VI

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The recording of volume holographic reflection gratings in eco-friendly photopolymers represents a challenge at present since they can be used in many important applications such as holographic optical elements and biosensors. In this sense, the aim of this work has been fabricated reflection gratings in the symmetrical experimental in "Biophotopol" and to study the dependence of diffraction efficiency on physical thickness, recording intensity and exposure energy. An increase in diffraction efficiency was observed when the photopolymer films were cured with a LED lamp to improve the stability of the reflection holograms. The maximums diffraction efficiencies around 30 % were obtained for reflection gratings with a spatial frequency of 4888 lines/mm. The index modulation and optical thickness were obtained by fitting procedure through Kogelnik's coupled wave theory. Experimental and theoretical results have been interpreted to modify the photopolymer formulation and exposure conditions in order to increase the diffraction efficiencies.

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Section: Resultsmentioning

confidence: 99%

Section: Analysis Of Experimental Data Through Kogelnik's Coupled Wavmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Reflection holograms stored in an environment-friendly photopolymer

Ramírez

Sirvent

Ortuño

et al. 2019

Holography: Advances and Modern Trends VI

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“…Each diffracted wave in the layer is calculated and all diffracted waves are added, leading to the final diffraction beam. This simulation has been limited to cases in which the recording medium was located normal to the signal beam axis [7,8]. However, in angle multiplexed holograms using the high NA object lens to increase data recording density, since the convergent angle of the signal beam becomes large, a configuration in which the medium is tilted with respect to the signal beam axis is required for irradiating the reference beam at various incident angles.…”

Section: Relation Between Aberration Components Of Wavefront and Snr mentioning

confidence: 99%

Compensation of hologram distortion by controlling defocus component in reference beam wavefront for angle multiplexed holograms

Muroi

Kinoshita

Ishii

et al. 2013

J. Eur. Opt. Soc.-Rapid Publ.

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Holographic memory has the potential to function as a recording system with a large capacity and high data-transfer-rate. Photopolymer materials are typically used as a write-once recording medium. When holograms are recorded on this medium, they can distort due to shrinkage or expansion of the materials, which degrades the reconstructed image and causes a higher bit error rate (bER) of the reproduced data. We propose optically compensating for hologram distortion by controlling aberration components in the reference beam wavefront while reproducing data, thereby improving the reproduced data quality. First, we investigated the relation between each aberration component of the reference beam and the signal to noise ratio (SNR) of the reproduced data using numerical simulation and found that horizontal tilt and the defocus component affect the SNR. Next, we experimentally evaluated the reproduced data by controlling the defocus component in the reference beam and found that the bER of the reproduced data could be decreased by controlling the defocus center with respect to the hologram position and phase modulation depth of the defocus component. Then, we investigated a practical control method of the defocus component using an evaluation value similar to the definition of the SNR for actual data reproduction from holograms. Using a defocus controlled wavefront enabled us to decrease the bER from 3.54 × 10 −3 with a plane wave to 3.14 × 10 −4 . We also investigated how to reduce the bERs of reproduced data in angle multiplexed holograms. By using a defocus controlled wavefront to compensate for hologram distortion on the 40th data page in 80-page angle multiplexed holograms, the bERs of all pages could be decreased to less than 1 ×10 −3 . We showed that controlling the defocus component is an effective way to compensate for hologram distortion and to decrease the bER of reproduced data in holographic memory.

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“…In some cases, color reflection holograms have been stored [7], and thanks to their properties, relative humidity sensors based on the color of the hologram have been created [8]. Other studies have examined how certain materials behave when reflection gratings are stored in them [6,[9][10][11][12], and multiplexed gratings have even been obtained [13].…”

Section: Introductionmentioning

confidence: 99%

Analysis of holographic reflection gratings recorded in polyvinyl alcohol/acrylamide photopolymer

et al. 2013

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Holographic reflection gratings in a polyvinyl alcohol/acrylamide based photopolymer were stored using symmetrical geometry in three different thicknesses of the material. The advantage of symmetrical geometry is that exact expressions for transmittance, reflectance, and electric fields can be obtained analytically. Using these expressions, experimental data were fitted to obtain parameters such as refractive index modulation, spatial period of the grating, optical thickness or shrinkage of the material.

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Numerical evaluation of angular multiplexing in reflection-type holographic data storage in photopolymer with shrinkage

Cited by 18 publications

References 12 publications

Reflection holograms stored in an environment-friendly photopolymer

Reflection holograms stored in an environment-friendly photopolymer

Compensation of hologram distortion by controlling defocus component in reference beam wavefront for angle multiplexed holograms

Analysis of holographic reflection gratings recorded in polyvinyl alcohol/acrylamide photopolymer

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