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Sub-Terabyte Optical Disc Realized by Three-Dimensional Pit Selection

Three-dimensional pit selection (3DPS) is proposed for optical discs with the capacity of hundreds of gigabytes, where the super-resolution and multi-layer techniques are combined. In this method, a high transmittance of each layer is obtained by discrete opaque data pits made of a super-resolution material. The dual-layer disc was fabricated using a phase-change material as a pit material. The experimental data show that the super-resolution effect is obtained for both layers. The additional advantages and the future expandability are discussed