Optical information reproduction device, optical information reproduction method, and information recording medium

摘要

An optical information reproduction device includes a light source (14) configured to emit reproduction light, a plasmon resonance element (9) including a resonance section (22) arranged adjacent to a recording region (4) of a recording layer (2), the resonance section (22) causing plasmon resonance between the recording region (4) and the resonance section (22), a photodetector (17a) configured to detect reflected light or transmitted light from the plasmon resonance element (9) on which the reproduction light is irradiated, and a reproduction unit (24) configured to determine, on the basis of a detection signal from the photodetector (17a), whether the recording region (4) is in a recorded state or an unrecorded state, and reproduce information recorded in the recording region (4).

主权项

1. An optical information reproduction device that reproduces information recorded on an information recording medium including at least a substrate and a recording layer, the optical information reproduction device comprising:
a light source configured to emit reproduction light; a plasmon resonance element including a resonance section arranged adjacent to a recording region of the recording layer, the resonance section causing plasmon resonance between the recording region and the resonance section; a photodetector configured to detect reflected light or transmitted light from the plasmon resonance element on which the reproduction light is irradiated; and a reproduction unit configured to determine, on the basis of a detection signal from the photodetector, whether the recording region is in a recorded state or an unrecorded state, and reproduce information recorded in the recording region.