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Ultra-High Density Optical Data Storage

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Ultra-High Density Optical Data Storage ULTRA-HIGH DENSITY OPTICAL DATA STORAGE M.S. Shahriar, L. Wong, M. Bock, and B. Ham Massachusetts Institute of Technology, Cambridge, MA 02139 P.R. Hemmer Air Force Research Laboratory, Hanscom, MA 01731 Abstract ROM using a novel, polymer-based material we have developed for thick holography. In section 3, we present We have developed a novel, polymer-based material results from our efforts towards realizing a cryogenic RAM suitable for shrinkage-free thick holography. It can be with a capacity approaching a petabits per cubic produced in arbitrary shapes and sizes, with optical quality centimeter, by mutiplexing volume holography with two- surfaces and very low scattering noise. A combination of photon spectral hole-burning in a crystal of Pr:YSO. spatial and angular multiplexing in this material can be used to produce a holographic CD-ROM with a storage 2. Terabyte CD-ROM Using Holographic capacity of one terabyte in the near future. We have Storage in a Polymer. demonstrated storage and recall of 1920 frames of a video in a small sample of this material. The storage capacity of The ability to store a large number of holograms in a single holography can be enhanced further by adding spectral recording material is important for the implementation of multiplexing. In a crystal of Pr:YSO, we have optical neural networks, optical interconnects, and demonstrated spectral multiplexing in two frequency holographic computing elements. Recently, a strong effort dimensions, at temperatures greater than 10 K. This has been undertaken by several groups to develop high approach will enable us to achieve a storage capacity volume data storage devices using holograms. exceeding a petabit per cubic cm, using commercially In volume holography, any information is encoded available lasers and closed-cycle cryostats. only in the spatial structure of the optical fields. As such, the fundamental storage capacity in such a system is Key Words limited to ∼V/λ3, where V is the volume, and λ is the wavelength of light. In practice, this limit is difficult to 210.2860 Holographic and volume memories; 090.7330 achieve; various techniques, including angle multiplexing, Volume holographic gratings; 210.4810 Optical storage- wavelength multiplexing, orthogonal phase encoding, and recording materials; 020.1670 Coherent optical effects. fractal-space multiplexing, or a combination thereof have been employed to improve the storage density, although 1,2 1. Introduction: still well below the limit . For volume holography, a thickness of between 0.5 The capacity of digital data storage devices tends to dictate and 1 cm provides optimum storage density, due to the scope of applications computers can be used for. As constraints imposed by optical access requirements. Data such, the demand is strong for storage techniques with storage using holograms of such thickness have so far only ever-increasing volumes of memory. In recent years, been performed in photorefractive crystals. However, efforts have been underway to develop data storage units polymeric systems generally have several distinct using holography. In this paper, we discuss recent advantages over photorefractive systems. These include developments in our group at MIT towards developing much lower cost, lack of constraint in shape, higher ultra-high capacity holographic memory devices. In diffraction efficiency, simplicity of fixing, a wide spectral section 2, we describe the recent progress we have made bandwidth, and lower refractive index (1.6, compared to2.2 towards the development of a one terabyte capacity CD- for typical photorefractives) which implies a larger field of view, However, to date, only thin ( 100 µm or less) holograms have been successfully used to demonstrate storage in photopolymeric structures. This is due to a host of problems in creating thick holograms of good quality. These problems span issues such as differential shrinkage, non-uniformity of active elements through the substrate, difficulty in embedding materials into substrates, and lack of high quality optical surfaces. As a result, the full potential of holographic data storage in photopolymers is limited by the useful thickness. For example, the storage achievable in a 100 µm holograms is theoretically two orders of magnitude smaller than what can be achieved in a 1 cm thick hologram. Even within the current limits due to optical accessing architectures, it should be possible to store as much as 1012 bytes in a 1 cm thick disc with a RECONSTRUCTED IMAGE #1 diameter of 15 cm. Recently, we have produced high optical quality samples of a holographic substrate called PDA (polymer with diffusion amplification), with high writing efficiency (about a factor of 100 better than lithium niobate), very low scattering , and a large index modulation capacity. Briefly, this material consists of a quinone based dye, embedded in polymethylmethacrylate (PMMA). This medium uses the novel principle of diffusion amplification of holograms on polymeric recording media. Photoexposure of this system results in writing of two out- of-phase periodic structures that partially compensate each other. One of these is formed by a concentration distribution of chromatophore groups combined into macromolecules, while the other is formed by free molecules. As a result of diffusion of the free molecules, the corresponding grating degrades, and the resulting Figure1. Comparison of the original with the holographic grating is amplified without additional processing. The reconstruction of one of the ten images stored in a thick surviving grating is stored in macromolecules that do not PDA sample 5 mrads apart. diffuse3. We have demonstrated storage and recall of ten similar to what is shown in figure 2, with the exception that orientations of the Air Force resolution chart, written 5 SLM/CAM is replaced by an SLM alone, there was no mrads apart, in a sample about 3 mm thick4. Figure 1 cat’s eye mirror for readout, and the angular multiplexing shows one of these images, comparing the original to the was done in one dimension only. The 16 different spatial reconstruction. Note that the reconstructed image is locations were selected by moving the medium around virtually identical to the original, indicating a very low bit horizontally and vertically. After the images were written error rate. and developed, a ccd camera was used to read out the Following this encouraging result, we have stored and images. The results from this experiment, meant primarily recalled digitized frames of a skating video clip of more to test the basic features of our architecture, are very than two minutes in duration. The video was sampled at preliminary. For high fidelity reproduction of the images, about 15 frames per second, and digitized into a 256 bits X we have to include pixel matching, data thresholding, and 256 bits image, compatible with the SLM from error correction coding/decoding. This video can be Displaytech, Inc., of Boulder, CO. These frames were viewed at our website: http: //qop.mit.edu. divided into 16 subgroups, each containing 128 frames. Currently we are developing a PDA-based Images in a single subgroup were recorded in a single Holographic CD-ROM (HCD) with a storage capacity of 1 spatial location (4mm X 4mm), using angular multiplexing terabyte. The memory system will be developed with a at 1.7 mrads (0.1 degree) apart. The architecture used is built-in I/O peripheral system compatible with desktop computers. Such a memory unit will be cost-effective ORIGINAL IMAGE #1 compared to existing alternatives (such as 2000 conventional CD-ROMs). Commercial application of the than the Bragg selectivity, to avoid cross talk). This HCD includes archival storage, video delivery systems, corresponds to about 800 different Bragg selected and associative memory based search engines. holograms. We will multiplex this further by a factor of 10 by tilting the reference beam in the vertical direction, using Optical and Material Specifications for HCD a third scanning mirror (M2 in figure 2). The total number In order to determine the details of the architecture, it is of holograms written at one position will be 8000. The useful to consider first the constraints imposed by optics, number of bits in a single page will be 1024X1024, so that detectors and the holographic material. For the optical the net storage capacity will be 1 terabyte. system, we note that the hologram will be written in the The beam expander (BE) and the lens assembly for image plane, and assume that the minimum resolvable spot imaging are constructed to minimize aberrations, and size will be 4 microns, a goal easily achievable for the guarantee a minimum image resolution of 4 µm. To write wavelength of 514 nm and the read wavelength of transfer the data from the SLM to the interference plane, 516 nm. For the detector array, the integration time will be the image is reduced by about a factor of 2, since the SLM about 1 ms, during which at least 100 photons will be pixel size is about 7.6 µm. The waveplates and polarizers detected per pixel. Assuming the shot noise limit (with the are oriented to maximize the image contrast. detector assembly Peltier-cooled), this will correspond to a A set of microcontrollers (such as the Motorolla minimum signal to noise ratio of about 10. For the M68HC11) in master-slave configurations will control the holographic material, the maximum number of holograms operation of the whole system. A memory buffer of about at a single spatial location is determined by the M# and the 100 megabyte (corresponding to 800 memory pages) will noise floor established by the scattering caused by surface be used to hold the data temporarily before each horizontal and volume inhomogeneities. Consider first the role of the angular scan. The microcontroller system will regulate the M#, which determines the index modulation capacity, and I/O handshake with the mainframe computer.
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