Three-Dimensional Data Storage
Content
Three-Dimensional Data Storage
Today’s Data Storage Medium
Maximum data storage limits we have reached today: 15.9G.B on a double-layer, doubled sided DVD. 750 GB on SATA hard disk.
Is this enough??
Holographic Storage Technology
Holographic storage is a breakthrough technology that stores information within its volume. It utilizes the space within special types of crystals with optical characteristics, which are very similar those used to create 3D holograms. It has ability to accurately focus the reference laser on the exact position within the crystal to retrieve that page of information.
Holographic storage is an optical technology that allows 1 million bits of data to be written or read in a single flash of light. Imagine 2GB of data on a postage stamp, 20GB on a credit card, or 200 GB on a disc. 1 TB on multi-layer discs. Combining high storage densities and fast transfer rates with durable, reliable, low cost media, Holographic technology is poised to become a compelling choice for next-generation storage and content distribution needs.
Holographic storage incorporates the use of laser, optics, images sensors and special crystals that respond to laser light. For recording, it utilizes intersecting signal and reference laser beams to store data in a number of 3D hologram images capable of saving hundreds of data pages in a single location. Since it involves no moving parts, holographic data storage will be far more reliable than existing hard disk technologies.
How To Write Data?
SLM:-Spatial Light Modulator.
Two Coherent beams, one carrying a page of information, interfere within a photosensitive material to record a hologram.
Ref: http://en.wikipedia.org/wiki/Holography
How To Read Data?
Illuminating the hologram with the reference beam reconstructs a copy of the original information bearing beam for capture with a detector array.
Parallel Reading
Illuminating multiple stored holograms with a new page of search information reconstructs all of the reference beams, computing in parallel the correlation between data and each of the stored pages.
Holographic Versatile Disc structure
1. Green writing/reading laser (532 nm) 2. Red positioning/addressing laser (650 nm) 3. Hologram (data) 4. Polycarbonate layer 5. Photo polymeric layer (data) 6. Distance layers 7. Diachronic layer (reflecting green light) 8. Reflective layer (reflecting red light) 9. Transparent base P. PIT
Ref: www.holographicversatile.com
This type of disc has transfer rate of 1G bit/s.
Advantages
In contrast to surface storage techniques such as CD/DVD, where the density is inversely proportional to the square of the wavelength, holographic is a volumetric technique, making the density proportional to one over the third power of the wavelength. Laser beams can be moved with no mechanical components, allowing access data times of the order of 10 micro seconds, faster than any conventional disk drive will ever able to randomly access data. Holographic data storage has shown the capability of rapid parallel search through the stored data via associative retrieval. By varying the reference beam angle, wavelength or media position many different holograms can be recorded in the same volume of material.
Fluorescent Multi–Layer Storage Technology
The concept of multi-layer reflective optical discs has been proposed by Philips and IBM. It is a unique breakthrough, solving the problems of signal degradation associated with reflective optical disc technologies of CD/DVD.
With FMD/C technology, each storage layer is coated with a transparent fluorescent material rather than metallic layer of CD/DVD. Backward compatibility with existing CD/DVD media. It allows parallel reading. A sequence of bits is recorded not along a track but deep into layers.
In case of CD/DVD, due to multiple interferences the process of reading data from discs becomes more complicated as the number of layers increases.
According to FMD-ROM developers, even with a hundred layers a useful signal will be acceptable.
How to write data?
The first principle (thermal) implies usage of material which possesses fluorescent properties from the beginning (logical one). And when recording those segments which are thermally acted upon with a laser lose these properties (logical zero). (WORM) The second principle (chemical) means usage of a material that doesn't possess fluorescent properties form the beginning. When acting upon with a laser a photochemical reaction starts, and the material gets fluorescent properties. There, a low-power laser is enough, or even a usual LED.
Fluorescent Multi-layer Disc
Fluorescent Multilayer card
The fluorescent multilayer card is a card containing a square shaped clear part which has multiple layers each with a different fluorescent material that reflects light at a different frequency than the other layers, so that the number of layers is limited only by the thickness of the card. A card with the data area roughly 25 mm or one inch wide, able to hold 10 GB of data.
FMD/C Advantages
The multi-layer system is optically transparent and homogeneous. No absorption for the emitted signal fluorescent light. The emitted fluorescent light from any given layer is non - coherent, eliminating the problem of multiple interference. FMD technology is compatible with current CD and DVD formats.
Future Scope
A holographic format, ”Tapestry Media”, capable of storing up to 1.6TB with a data transfer rate of 120 MB/s. Hitachi Maxell, Ltd. plans to enter the market by offering 300 GB discs with a data transfer rate of 20 MB/s. A 50 GB prototype disc was demonstrated at the COMDEX industry show in November 2000. First generation FMDs were to use 650 nm red lasers, yielding roughly 140 GB per disc. Second and third generation FMDs were to use 405 nm blue lasers, giving capacities of up to a TB.
Thank You
Today’s Data Storage Medium
Maximum data storage limits we have reached today: 15.9G.B on a double-layer, doubled sided DVD. 750 GB on SATA hard disk.
Is this enough??
Holographic Storage Technology
Holographic storage is a breakthrough technology that stores information within its volume. It utilizes the space within special types of crystals with optical characteristics, which are very similar those used to create 3D holograms. It has ability to accurately focus the reference laser on the exact position within the crystal to retrieve that page of information.
Holographic storage is an optical technology that allows 1 million bits of data to be written or read in a single flash of light. Imagine 2GB of data on a postage stamp, 20GB on a credit card, or 200 GB on a disc. 1 TB on multi-layer discs. Combining high storage densities and fast transfer rates with durable, reliable, low cost media, Holographic technology is poised to become a compelling choice for next-generation storage and content distribution needs.
Holographic storage incorporates the use of laser, optics, images sensors and special crystals that respond to laser light. For recording, it utilizes intersecting signal and reference laser beams to store data in a number of 3D hologram images capable of saving hundreds of data pages in a single location. Since it involves no moving parts, holographic data storage will be far more reliable than existing hard disk technologies.
How To Write Data?
SLM:-Spatial Light Modulator.
Two Coherent beams, one carrying a page of information, interfere within a photosensitive material to record a hologram.
Ref: http://en.wikipedia.org/wiki/Holography
How To Read Data?
Illuminating the hologram with the reference beam reconstructs a copy of the original information bearing beam for capture with a detector array.
Parallel Reading
Illuminating multiple stored holograms with a new page of search information reconstructs all of the reference beams, computing in parallel the correlation between data and each of the stored pages.
Holographic Versatile Disc structure
1. Green writing/reading laser (532 nm) 2. Red positioning/addressing laser (650 nm) 3. Hologram (data) 4. Polycarbonate layer 5. Photo polymeric layer (data) 6. Distance layers 7. Diachronic layer (reflecting green light) 8. Reflective layer (reflecting red light) 9. Transparent base P. PIT
Ref: www.holographicversatile.com
This type of disc has transfer rate of 1G bit/s.
Advantages
In contrast to surface storage techniques such as CD/DVD, where the density is inversely proportional to the square of the wavelength, holographic is a volumetric technique, making the density proportional to one over the third power of the wavelength. Laser beams can be moved with no mechanical components, allowing access data times of the order of 10 micro seconds, faster than any conventional disk drive will ever able to randomly access data. Holographic data storage has shown the capability of rapid parallel search through the stored data via associative retrieval. By varying the reference beam angle, wavelength or media position many different holograms can be recorded in the same volume of material.
Fluorescent Multi–Layer Storage Technology
The concept of multi-layer reflective optical discs has been proposed by Philips and IBM. It is a unique breakthrough, solving the problems of signal degradation associated with reflective optical disc technologies of CD/DVD.
With FMD/C technology, each storage layer is coated with a transparent fluorescent material rather than metallic layer of CD/DVD. Backward compatibility with existing CD/DVD media. It allows parallel reading. A sequence of bits is recorded not along a track but deep into layers.
In case of CD/DVD, due to multiple interferences the process of reading data from discs becomes more complicated as the number of layers increases.
According to FMD-ROM developers, even with a hundred layers a useful signal will be acceptable.
How to write data?
The first principle (thermal) implies usage of material which possesses fluorescent properties from the beginning (logical one). And when recording those segments which are thermally acted upon with a laser lose these properties (logical zero). (WORM) The second principle (chemical) means usage of a material that doesn't possess fluorescent properties form the beginning. When acting upon with a laser a photochemical reaction starts, and the material gets fluorescent properties. There, a low-power laser is enough, or even a usual LED.
Fluorescent Multi-layer Disc
Fluorescent Multilayer card
The fluorescent multilayer card is a card containing a square shaped clear part which has multiple layers each with a different fluorescent material that reflects light at a different frequency than the other layers, so that the number of layers is limited only by the thickness of the card. A card with the data area roughly 25 mm or one inch wide, able to hold 10 GB of data.
FMD/C Advantages
The multi-layer system is optically transparent and homogeneous. No absorption for the emitted signal fluorescent light. The emitted fluorescent light from any given layer is non - coherent, eliminating the problem of multiple interference. FMD technology is compatible with current CD and DVD formats.
Future Scope
A holographic format, ”Tapestry Media”, capable of storing up to 1.6TB with a data transfer rate of 120 MB/s. Hitachi Maxell, Ltd. plans to enter the market by offering 300 GB discs with a data transfer rate of 20 MB/s. A 50 GB prototype disc was demonstrated at the COMDEX industry show in November 2000. First generation FMDs were to use 650 nm red lasers, yielding roughly 140 GB per disc. Second and third generation FMDs were to use 405 nm blue lasers, giving capacities of up to a TB.
Thank You
