Holographic data storage at 2+ Tbit/in<sub>2</sub>

Ayres, Mark; Anderson, Kent; Askham, Fred; Sissom, Brad; Urness, Adam C.

doi:10.1117/12.2080156

Cited by 5 publications

(7 citation statements)

References 5 publications

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“…2.2.2, signal amplitude a s can be estimated from the detected intensity I WDD in Eq. (22) when the medium position is shifted in the z direction. Then, the amplitude deviation factor is also the sinc function in Eq.…”

Section: Proposed Oscillator Page Recording Methodsmentioning

confidence: 99%

“…quadrature phase shift keying (QPSK) and 16 quadrature amplitude modulation (16QAM). 16,17,[20][21][22] These methods can increase the amount of information per pixel compared to ASK, and realize the high recording density and high transfer rate of HDSS. However, since light has an overwhelmingly high-frequency relative to a camera's exposure time; thus, the phase of light cannot be detected directly.…”

Section: Signal Degradation In Wddmentioning

confidence: 99%

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Wavelength diversity detection for phase-modulation holographic data storage system

Nakamura

Fujimura

2020

Jpn. J. Appl. Phys.

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The wavelength diversity detection (WDD) method for a holographic data storage system (HDSS) actively utilizes scattering from the media to suppress speckle noise with a finite bandwidth light source. In this study, we analytically and numerically revealed signal degradation in the case of a phase-modulation HDSS under WDD in practical conditions, e.g. recording medium position shift; and we proposed an oscillator page recording method to suppress such degradation. Using phase modulation, an oscillator beam must retrieve the recorded phase from interference between the oscillator beam and the reproduced signal beam. The proposed method also records the oscillator beam as a hologram, and simultaneously reproduces the two beams. Simulation results indicate that the proposed method can compensate the degradation and drastically improve the signal-to-noise ratio from 6.5 to 39.1 dB at the largest possible media shift. Therefore, we confirmed feasibility to utilize WDD in PSK under the practical condition.

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Section: Proposed Oscillator Page Recording Methodsmentioning

confidence: 99%

Section: Signal Degradation In Wddmentioning

confidence: 99%

Wavelength diversity detection for phase-modulation holographic data storage system

Nakamura

Fujimura

2020

Jpn. J. Appl. Phys.

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“…However, at higher pitch recordings, there is a noticeable decrease in Δn with a reported value of less than 0.01 for a 1 μm grating. 32 Here, a stage 1 urethane and stage 2 acrylate formulation, similar to existing commercial materials, 32,33 were combined to yield superior orthogonality and Δn recording performance relative to most other two-stage formulation systems. Focusing on maximizing the solubility of the writing monomer in a urethane matrix without reducing the Δn, a colorless, low viscosity, high refractive index (n D = 1.6) liquid acrylate monomer, 1,3-bis(phenylthio)-2-propyl acrylate (BPTPA), was designed and synthesized using a facile synthetic route involving only two relatively simple steps.…”

Section: Introductionmentioning

confidence: 99%

High Dynamic Range (Δn) Two-Stage Photopolymers via Enhanced Solubility of a High Refractive Index Acrylate Writing Monomer

Alim

Glugla

Mavila

et al. 2017

ACS Appl. Mater. Interfaces

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Holographic photopolymers capable of high refractive index modulation (Δn) on the order of 10 are integral for the fabrication of functional holographic optical elements that are useful in a myriad of optical applications. In particular, to address the deficiency of suitable high refractive index writing monomers for use in two-stage holographic formulations, here we report a novel high refractive index writing monomer, 1,3-bis(phenylthio)-2-propyl acrylate (BPTPA), simultaneously possessing enhanced solubility in a low refractive index (n = 1.47) urethane matrix. When examined in comparison to a widely used high refractive index monomer, 2,4,6-tribromophenyl acrylate, BPTPA exhibited superior solubility in a stage 1 urethane matrix of approximately 50% with a 20% higher refractive index increase per unit amount of the writing monomer for stage 2 polymerizations. Formulations with 60 wt % loading of BPTPA exhibit a peak-to-mean holographic Δn ≈ 0.029 without obvious deficiencies in transparency, color, or scatter. To the best of our knowledge, this value is the highest reported in the peer-reviewed literature for a transmission hologram. The capabilities and versatility of BPTPA-based formulations are demonstrated at varying length scales via demonstrative refractive index gradient structure examples including direct laser write, projection mask lithography of a 1″ diameter Fresnel lens, and ∼100% diffraction efficiency volume transmission holograms with a 1 μm fringe spacing in 11 μm thick samples.

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“…Currently, the number of angular multiplexed holograms is limited by the maximum available angular space for the reference beam, 180 degrees, which is already partially occupied by the object angular extent. To further increase capacity in keeping up with improving recording media [5], additional DOFs are needed to multiplex even more holograms while minimizing the modification of system optics and signal encoding schemes. As demonstrated previously, resonant optical cavities can be employed in readout [6] and recording [7] to recover much of the conventionally wasted light allowing for effective gains in energy efficiency, data transfer rates, and storage densities.…”

Section: Introductionmentioning

confidence: 99%

Cavity-enhanced eigenmode and angular hybrid multiplexing in holographic data storage systems

Miller

Takashima

2016

Opt. Express

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Abstract:Resonant optical cavities have been demonstrated to improve energy efficiencies in Holographic Data Storage Systems (HDSS). The orthogonal reference beams supported as cavity eigenmodes can provide another multiplexing degree of freedom to push storage densities toward the limit of 3D optical data storage. While keeping the increased energy efficiency of a cavity enhanced reference arm, image bearing holograms are multiplexed by orthogonal phase code multiplexing via Hermite-Gaussian eigenmodes in a Fe:LiNbO 3 medium with a 532 nm laser at two Bragg angles. We experimentally confirmed write rates are enhanced by an average factor of 1.1, and page crosstalk is about 2.5%. This hybrid multiplexing opens up a pathway to increase storage density while minimizing modification of current angular multiplexing HDSS.

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Holographic data storage at 2+ Tbit/in₂

Cited by 5 publications

References 5 publications

Wavelength diversity detection for phase-modulation holographic data storage system

Wavelength diversity detection for phase-modulation holographic data storage system

High Dynamic Range (Δn) Two-Stage Photopolymers via Enhanced Solubility of a High Refractive Index Acrylate Writing Monomer

Cavity-enhanced eigenmode and angular hybrid multiplexing in holographic data storage systems

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Holographic data storage at 2+ Tbit/in2

Cited by 5 publications

References 5 publications

Wavelength diversity detection for phase-modulation holographic data storage system

Wavelength diversity detection for phase-modulation holographic data storage system

High Dynamic Range (Δn) Two-Stage Photopolymers via Enhanced Solubility of a High Refractive Index Acrylate Writing Monomer

Cavity-enhanced eigenmode and angular hybrid multiplexing in holographic data storage systems

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Holographic data storage at 2+ Tbit/in₂