Name
Abstract | ||
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The demand for increases in the capacity and speed of data storage tests the limits of conventional technologies and drives the search for new approaches. Optical holography has long held the promise of storage densities and data transfer rates far greater than those of traditional magnetic and optical systems. In the past, its realization has been frustrated by the lack of availability of suitable system components, the complexity of holographic multiplexing strategies, and perhaps most importantly, the absence of recording materials that satisfied the stringent requirements of holographic data storage. Here we report on the design and development of a high-performance photopolymer recording medium and on advances in the design of a holographic storage system that have enabled demonstrations of storage densities as high as 31.5 channel Gbits/in2. We believe these results will provide the foundation for a practically realizable, high capacity storage system with fast transfer rates and low-cost, removable recording media. 1. Introduction: How Holographic Data Storage Works The compelling features of volume holography, rapid transfer rates and ultrahigh storage densities, arise from two basic properties: (i) the writing and reading of bits of data occur in a parallel, page-wise fashion, unlike the serial read-write processes of most storage technologies; (ii) the three-dimensional nature of holography enables the storage of many of these pages of data within the same volume of a recording medium, thereby enabling densities far beyond the diffraction limit of conventional optical technologies. In holographic storage, light from a coherent laser source is split into two beams, signal (data-carrying) and reference beams. These two beams are spatially overlapped through the volume of a photosensitive storage medium producing an optical interference pattern that is imaged within the medium. This process records information contained in the phase and amplitude of the two beams. The optical interference pattern typically induces modulations in the refractive index of the recording material yielding diffractive volume gratings. A schematic of a typical holographic storage system is shown in Figure 1. The reference beam is used during readout to diffract off of the recorded grating and reconstruct the information that was contained in the signal beam. The readout of data depends sensitively upon the characteristics of the reference beam. By varying the reference beam, for example by changing its angle of incidence or wavelength, different holograms can be recorded in the same volume of material and read out by applying a |
Year | Venue | Keywords |
|---|---|---|
2000 | IEEE Symposium on Mass Storage Systems | data transfer,refractive index,satisfiability,data storage,three dimensional,storage system |
Field | DocType | Citations |
Recording media,Holography,Holographic data storage,Data transmission,Computer data storage,Computer science,High density,Communication channel,Computer hardware,Multiplexing | Conference | 0 |
PageRank | References | Authors |
0.34 | 0 | 9 |
Name | Order | Citations | PageRank |
|---|---|---|---|
| Lisa Dhar | 1 | 0 | 0.34 |
| Kevin Curtis | 2 | 0 | 0.34 |
| Arturo Hale | 3 | 0 | 0.34 |
| Melinda Schnoes | 4 | 0 | 0.34 |
| William Wilson | 5 | 0 | 0.34 |
| Michael Tackitt | 6 | 0 | 0.34 |
| Adrian Hill | 7 | 3 | 1.18 |
| Marcia Schilling | 8 | 0 | 0.34 |
| Howard Katz | 9 | 0 | 0.34 |