| 摘要 |
PROBLEM TO BE SOLVED: To increase data readout rate and to suppress crosstalk, in an optical waveguide type hologram recording medium. SOLUTION: A two-layer structure is provided to, for example, one cladding layer 4 of two cladding layers 3, 4 so stacked that a core layer 2 as an optical waveguide on which reference light B1 is made incident is held between these, and a hologram pattern is formed between the two layers of the cladding layer 4. At this time, the first cladding layer 4a kept in contact with the core layer 2 is made of a photorefractive material whose refractive index rises upon irradiation with access light B2 different from the reference light B1, so that diffracted light according to the hologram pattern 5 can be emitted to the outside only in the irradiated region. As a result, light utilization efficiency increases to increase data readout rate, and stray light is controlled to suppress crosstalk. COPYRIGHT: (C)2006,JPO&NCIPI
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