| 摘要 |
An optical storage medium having at least two information layers is provided, wherein a first information layer is in the form of a dichroic filter that is reflective at a first selected wavelength and transmissive at a second selected wavelength. The dichroic filter can consist of a single, non-metallic dielectric layer, such as a hydrogen-doped silicon layer. Total thickness of the dichroic filter is about or less than 100 nm. A second information layer that is reflective at the second wavelength is disposed behind and spaced from the dichroic filter. This construction permits a first incident light beam at the first wavelength to be reflected from the dichroic filter, to produce a first reflected beam carrying information recorded in that layer. A second incident light beam at the second wavelength can be transmitted through the dichroic filter and reflected from the second information layer to produce a second reflected beam that passes through the dichroic filter, carrying information recorded in the second information layer.
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