Prospects and Limitations for Large Numbers of Multi-Layers in Optical Data Storage

Fourth-generation technologies that use multiple layers are now under investigation. This presentation describes the inter-layer interference and crosstalk characteristics of multiple layers under several illumination conditions using Babinet decomposition of the recording structure. Limitations based on performance bounds are introduced for various film characteristics, like reflectivity, transmission and layer spacing. Primary results include that the total crosstalk is minimized for certain layer spacings for both coherent and incoherent illuminations. The incoherent illumination shows lower values of total crosstalk and more generous tolerances than the coherent illumination