US Patent 7570567 Multi-layered holographic read-only memory and data retrieval method

Patent 7570567 was granted and assigned to Nippon Telegraph and Telephone on August, 2009 by the United States Patent and Trademark Office.

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Patent Inventor Names

Haruki Kozawaguchi0

Hiroki Yamazaki0

Michio Ono0

Shougo Yagi0

Tadayuki Imai0

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Patent 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.

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Official Website

https://pdfpiw.uspto.gov/.piw?Docid=07570567

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