Phase modulated gray-scale data pages for digital holographic data storage

Das, Bhargab; Joseph, Joby; Singh, Kehar

doi:10.1016/j.optcom.2009.02.048

Cited by 24 publications

(20 citation statements)

References 16 publications

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“…PA-LCoS are high-resolution reflective devices which enable phase-only operation. They are ideal for binary or multinary phase-only data pages [18,19]. This leads to DC term cancellation when recording the Fourier transform of the data page, avoiding the premature saturation of the recording material.…”

Section: Using a Pa-lcos In A Holographic Data Storage Systemmentioning

confidence: 99%

Holographic Data Storage Using Parallel-Aligned Liquid Crystal on Silicon Displays

Guardiola¹,

Ruiz²,

Gallego³

et al. 2017

Holographic Materials and Optical Systems

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The parallel-aligned liquid crystal on silicon (PA-LCoS) microdisplay has become a widely used device for the photonics community. It is a very versatile tool that can perform several tasks which transforms it into a key element in many different photonics applications. Since our group is interested in holography, in this chapter, we want to use these displays as the data entry point for a holographic data storage system (HDSS). Due to the novelty of this kind of device, we have done an intense work characterizing it. These efforts are reflected in this chapter where the reader will find two different characterization methods that will enable to predict the performance of the device in a specific application. Additionally, we present how a phase-only device can be used as a data pager using different modulation schemes and combined with a photopolymer as the holographic recording material.

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Section: Using a Pa-lcos In A Holographic Data Storage Systemmentioning

confidence: 99%

Holographic Data Storage Using Parallel-Aligned Liquid Crystal on Silicon Displays

Guardiola¹,

Ruiz²,

Gallego³

et al. 2017

Holographic Materials and Optical Systems

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“…However, a detailed knowledge of the SLM modulation properties should be a necessity. A trick for evenly distributing the FT intensity was reported by Das et al based on pure phase modulated SLM [18,19]. The binary zeroes and binary ones in the data page are modulated with phase shift of 0 and π, respectively, and a uniform hologram is recorded on the FT plane.…”

Section: Introductionmentioning

confidence: 99%

“…The dc component is blocked before the FT hologram is recorded. The amplitude image can be reconstructed directly by illuminating the reference beam, which is much simpler than the method proposed by Das et al [18,19]. Since the uniform FT holograms are restored, the storage density will be increased because of the increase of the dynamic range.…”

Section: Introductionmentioning

confidence: 99%

Coaxial holographic encoding based on pure phase modulation

et al. 2011

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We describe a simple technique for coaxial holographic image recording and reconstruction, employing a spatial light modulator (SLM) modified in pure phase mode. In the image encoding system, both the reference beam in the outside part and the signal beam in the inside part are displayed by an SLM based on the twisted nematic LCD. For a binary image, the part with amplitude of "1" is modulated with random phase, while the part with amplitude of "0" is modulated with constant phase. After blocking the dc component of the spatial frequencies, a Fourier transform (FT) hologram is recorded with a uniform intensity distribution. The amplitude image is reconstructed by illuminating the reference beam onto the hologram, which is much simpler than existing phase modulated FT holography techniques. The technique of coaxial holographic image encoding and recovering with pure phase modulation is demonstrated theoretically and experimentally in this paper. As the holograms are recorded without the high-intensity dc component, the storage density with volume medium may be increased with the increase of dynamic range. Such a simple modulation method will have potential applications in areas such as holographic encryption and high-density disk storage systems.

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“…Holographic photopolymers, first reported in the late 1960s by Close et al [4], are attractive candidates for applications in data storage [5][6][7] though they have limited memory capacity at this moment. Holographic storage has long been the promise for large digital storage capacity because the information packing densities can be considerably increased by using three-dimensional storage techniques [8,9]. Various kinds of recording configurations have been proposed for this purpose [10,11].…”

Section: Introductionmentioning

confidence: 99%

Transflective multiplexing of holographic polymer dispersed liquid crystal using Si additives

Sun¹,

Kang²,

Kim³

2011

Express Polym. Lett.

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Abstract. Morphology, grating formation dynamics and electro-optical performance of transflective multiplexing with holographic polymer dispersed liquid crystal (HPDLC) were investigated in the presence of silica nanoparticles (Aerosil R812 (RS) and modified Aerosil 200 (MS)) and silicon monomer (vinyltrimethoxy silane (VTMS)) by using three coherent laser beams. The addition of Si additive significantly augmented the diffraction efficiencies of transmission and reflection gratings due to the enhanced phase separation with large LC channels. The film was driven only with Si additives which are enriched at the polymer-LC interfaces. As the additive content increased, driving voltage decreased to a minimum of 30 V at 2.0 wt% VTMS. It was found that the interface modification and large droplet size are crucial to operate the film. Among the three types of Si additive, VTMS showed the highest electro-optical performance due to its low viscosity and high reactivity.

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Phase modulated gray-scale data pages for digital holographic data storage

Cited by 24 publications

References 16 publications

Holographic Data Storage Using Parallel-Aligned Liquid Crystal on Silicon Displays

Holographic Data Storage Using Parallel-Aligned Liquid Crystal on Silicon Displays

Coaxial holographic encoding based on pure phase modulation

Transflective multiplexing of holographic polymer dispersed liquid crystal using Si additives

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