Theoretical Study of a Surface Collinear Holographic Memory
| Autor: | Tsutomu Shimura, Ryushi Fujimura, Yoshito Tanaka, Shinsuke Umegaki, Soki Hirayama |
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| Rok vydání: | 2019 |
| Předmět: |
lcsh:Applied optics. Photonics
holographic memory Holography collinear 02 engineering and technology 01 natural sciences Signal law.invention 010309 optics Optics law 0103 physical sciences 0202 electrical engineering electronic engineering information engineering Radiology Nuclear Medicine and imaging Instrumentation ComputingMethodologies_COMPUTERGRAPHICS Physics Computer simulation business.industry Noise (signal processing) Volume (computing) lcsh:TA1501-1820 Volume hologram Atomic and Molecular Physics and Optics Raman–Nath diffraction 020201 artificial intelligence & image processing business Optical disc Data rate units |
| Zdroj: | Photonics, Vol 6, Iss 2, p 70 (2019) Photonics Volume 6 Issue 2 |
| ISSN: | 2304-6732 |
| Popis: | Holographic memory is currently attracting attention as a data storage system capable of achieving a data transfer rate of about 105~106105~106 times that of an optical disc such as Blu-ray disc. In conventional holographic memory, data is generally recorded by optical writing using volume holograms. However, a volume hologram has the problem not only that it is required to have high mechanical accuracy of a system and low coefficient of thermal expansion of a recording medium, because reconstruction tolerance is extremely low, but also that duplicating time efficiency is poor because whole data cannot be recorded at once. In this paper we proposed surface holographic memory that achieved a high data transfer rate, stable readout performance, and collective duplication by expressing holograms with fine surface asperity. Furthermore, the theoretical formulas of recording and reconstruction processes in the proposed system were derived and the reconstruction characteristics of the hologram were evaluated by numerical simulation. As a result, the proposed method generated reconstructed image readout with sufficient signal for a single page recording. However, the reconstructed image had noise, which was particular to a surface holographic memory. |
| Databáze: | OpenAIRE |
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