Multi-layered holographic read-only memory and data retrieval method
US6556531B1 · kind B1 · utility
14Cited by
7References
13Claims
0Family size
Assignee
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Key dates
| Filing date | Feb 16, 1999 |
| Grant date | Apr 29, 2003 |
| Priority date | — |
| Expiry date | Feb 16, 2019 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03H2001/2615
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
An inexpensive multi-layered holographic read-only memory having a large capacity is provided. In the memory in which single-mode slab waveguides are multi-layered, a periodic scattering center whose period approximately agrees with the period of the guided mode is provided in at least one of a core layer and a clad layer in each waveguide so that a guided wave in the waveguide is diffracted by the periodic scattering center to the outside of the waveguide and a holographic image is generated.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.