Holographic memory
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It is a memory that can store information in form of holographic image.It is a technique that can store information at high density inside crystals or photopolymers.It provides data to be written beneath the surface of the disc.Holographic memory can store up to 1 Tb in a storage medium the size of a sugar cube crystal.
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Holographic memory
- 1. Seminar Report on HOLOGRAPHIC MEMORY
- 2. What is Holographic Memory ? • It is a memory that can store information in form of holographic image. • It is a technique that can store information at high density inside crystals or photopolymers. • It provides data to be written beneath the surface of the disc. • Holographic memory can store up to 1 Tb in a storage medium the size of a sugar cube crystal.
- 3. To spilt the laser beam To direct the laser beams spatial light modulator photopolymer Interprets the digital informationBlue-green argon laser Beam splitters Mirrors LCD panel Lithium- niobate crystal CCD camera Basic Components
- 5. Continues..
- 8. Shift Characteristics Shift multiplexing read/write can be done at 3μpitch Read-out Page DataShift: 1μm pitch Y X 2μm 3μm 1μm
- 9. Properties of Hologram • A block or sheet of photosensitive material which records the diffraction of two light sources. • A laser beam is splitted into two beams: Source beam Reference beam • The two beams diffracts to form the image on the recording medium.
- 10. Spatial light modulator • It is used for creating binary information out of laser light. • It is a 2D plane, consisting of pixels which can be turned on and off to create binary 1.s and 0.s. • It contains a two-dimensional array of windows, which are only microns wide.
- 11. Page Data Access • As the data is stored in the form of holograms, data retrieval must be in the same form. • So, a holographic system sends data in the form of pages. • It provides fast access times.
- 12. Error Correction • As the density of data is massive, it is prone to errors. • Errors can be controlled by: o Recording errors o Page level parity bits o Interfacing
- 13. Recording Errors • Cause: Noise generated by laser beam • Result: Can change a binary 0 to binary 1 • Possible Solution: Improvement in laser beam and recording material
- 14. Page-level Parity Bits • Data is stored in the form of 2-D array • Odd no. of bits accounts for parity 1 • Even no. of bits accounts for parity 0 • Parity check bits are used to identify any errors present in the array
- 15. APPLICATIONS OF HOLOGRAPHY • Product packaging • Data mining • Holograms are used in credit card, license, books, magazine. • Used in airplanes etc. in heads up display • Used in testing for fractures and quality control. • Application in future computer system. • Used in 3-D projection of artistic images or expressions.
- 16. CONCLUSION There is bright scope of advancement in the field of holography. The holographic storage provide high data density . It can easily store 1000GB of data in a small cubic centimeter crystal reducing the cost on the other hand .It may offer high data transfer rate. Till, the holographic storage is at the beginning stage, it will mark its existence soon in the market.
- 17. References • www.almaden.com • www.eik.bme.hu • www.vision.caltech.edu • Mansi, Mark “the hard disk survival guide” , BPB publications , 1993
- 18. QUERIES??
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- Figure 3 shows the reconstructed 2-D image from the hologram by shifting the position of recorded hologram in both X and Y axis. The reconstructed image is completely disappearing by 3 micron in both axes. This implies that we can record holograms by overlapping at a pitch of at least 3 micron. Figure 3: Shift selectivity Figure 4 shows SNR and the reconstructed image after 41 times overlapping recording at a pitch of 5 micron.