Progress in bit-wise volumetric optical storage using aluminum oxide single crystal media (original) (raw)
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Optical Data Storage 2007, 2007
Aluminum oxide single crystals doped with magnesium and carbon and having aggregate vacancy defects are proposed for volumetric fluorescent bit-wise data storage. A unique optical recording technique, which utilizes sequential twophoton absorption and incoherent confocal fluorescence detection, is utilized for nondestructive readout. The new medium is exceptionally environmentally and temporally stable and can be recorded with diode lasers. Recent static and dynamic test stand results are reported, including demonstration of 20 layers of data and random mark-length recording with a clear "eye pattern" and satisfactory carrier-to-noise ratio.
Fluorescent Aluminum Oxide Crystals for Volumetric Optical Data Storage and Imaging Applications
Journal of Fluorescence, 2000
New fluorescent aluminum oxide crystals (Al 2 O 3 :C,Mg) for volumetric optical data storage and imaging applications were investigated. Magnesium impurity and double oxygen vacancy aggregate defects are responsible for the main optical properties of the new material. Spectroscopic investigation of these defects in different charge states was performed. Optical absorption, excitation-emission spectra and fluorescent lifetime of the new fluorescent medium were studied. Quantum yield of fluorescence from Al 2 O 3 :C,Mg crystals was measured in comparison with standard laser dyes.
Multi-layer Optical Data Storage Based on Two-photon Recordable Fluorescent Disk Media
2001 Eighteenth IEEE Symposium on Mass Storage Systems and Technologies, 2001
In this paper, we present a technology that can be used for random accessed mass optical data storage. The technology uses a two-photon recordable plastic disk medium that can fluoresce when recorded and that can support multiple stored data layers inside one disk. This technology is capable of achieving 200GB data capacity with a 120mm diameter, 10mm thick disk, and a data transfer rate of Gigabits/Sec by using parallel readout.
3D Optical Data Storage in Organic Film using Single Photon Absorption
Optical Data Processing and Storage, 2016
Optical data storage is being investigated for use in enterprise archival data storage due to its stability, low energy consumption and low total cost of ownership. Here we present results on a method for manufacturing optical discs with dozens of writable layers using polymer coextrusion. This can greatly increase the capacity with low fabrication cost. Data are written by modulating the fluorescence of an organic dye, and exhibits a threshold dependence on the laser power, allowing the bits to be welllocalized in the intended layers. This is a result of the heat generated from the absorbed laser power, and is realizable with a continuouswave laser.We also discuss the lifetime and photostability of the dyes. These combined results promise a media that is lower in cost and higher in capacity than current commercial options.
Anisotropy of optical absorption and fluorescence in Al[sub 2]O[sub 3]:C,Mg crystals
Journal of Applied Physics, 2005
Spectroscopic properties of recently discovered fluorescent sapphire single crystals ͑Al 2 O 3 :C,Mg͒, developed for volumetric optical data storage, are investigated. Polarized optical absorption, excitation-emission spectra, and quantum yield of fluorescence of the crystal in two different photochromic states are studied. The spatial distribution of intensity and polarization ratio of the fluorescence associated with the 435/ 520-and 620/ 750-nm excitation-emission bands, characteristic of the two photochromic states of the crystal, display strong anisotropy. The intensity distribution, and hence the spatially averaged quantum yield of fluorescence for the two states, measured relative to standard laser dyes are similar for different crystallographic orientations. The average quantum yield is found to be close to unity for both the states. The anisotropic properties of optical absorption and fluorescence suggest a model of double oxygen vacancy.
Aluminum Oxide Photonic Crystals Grown by a New Hybrid Method
Advanced Materials, 2001
20] Although bulk gold has a small real component of the refractive index and a large imaginary component, the absorption of the bulk colloid solution at the probing wavelength was minimal. Therefore, expansion of the Kogelnik theory to account for absorption was neglected.
Proceedings of the Japan Academy, Series B, 2001
Three-dimensional erasable optical recording in a single crystal of 1,2-bis(3-methyl-2thienyl)perfluorocyclopentene (1), which shows a reversible fluorescence change with the photochromic reaction, has been demonstrated. The recorded spot size read by a fluorescence-detection method was approximately 200 nm in plane and 1.5 urn in depth, which corresponds to the recording density higher than 5 Tbit/cm3. The recorded spots were erased by irradiation with visible light. The writing/reading/erasing cycle could be repeated more than 104 times.
Ultra-high density optical data storage in common transparent plastics
Scientific reports, 2016
The ever-increasing demand for high data storage capacity has spurred research on development of innovative technologies and new storage materials. Conventional GByte optical discs (DVDs and Bluray) can be transformed into ultrahigh capacity storage media by encoding multi-level and multiplexed information within the three dimensional volume of a recording medium. However, in most cases the recording medium had to be photosensitive requiring doping with photochromic molecules or nanoparticles in a multilayer stack or in the bulk material. Here, we show high-density data storage in commonly available plastics without any special material preparation. A pulsed laser was used to record data in micron-sized modified regions. Upon excitation by the read laser, each modified region emits fluorescence whose intensity represents 32 grey levels corresponding to 5 bits. We demonstrate up to 20 layers of embedded data. Adjusting the read laser power and detector sensitivity storage capacities ...