One-Head Near-Field Writing/Erasing on a Rewritable Dual-Layer Optical Disk Having High-Index Cover and Separation Layers

Recording characteristics of high-density thin optical disk using near-field optical recording

“…Fourfold higher density recording using NFR optical disks with 1.2-mm-thick disks has been reported, 12,14) and studies of larger capacity using multilayer recording using NFR have been reported. 15,16) If the NFR media can realize 250-Mbpsclass high-speed recording and two-or three-layer recording, the SHV optical media, which has more than two hours recording ability would be able to be realized. Studies [19][20][21][22][23] on the maximum of sixteen-multilayer recording using farfield optical recording of the Blu-ray format have led to a data capacity of 2 TBytes the NFR system has a feasibility of the data capacity of 2 TBytes.…”

“…[2][3][4][5][6][7][8][9][10][11][12][13][14][15][16] It can exhibit a large capacity and a highdata transfer rate towards recording next-generation ultrahigh-definition television [i.e., Super Hi-Vision (SHV), 7320 Â 4320 pixels] video signals 17,18) for home-use. Fourfold higher density recording using NFR optical disks with 1.2-mm-thick disks has been reported, 12,14) and studies of larger capacity using multilayer recording using NFR have been reported.…”

Low-cost ultrahigh areal density optical disc system towards 400 Gbyte/disc

“…Several high-density optical disc techniques have been proposed to reduce the media cost, including volume holographic memory, [3][4][5][6] a super-resolution head, [7][8][9][10][11][12] 3-beam optical heads with a crosstalk-cancelling circuit, 13) multilayered technology for optical discs, [14][15][16][17][18] and a two-photon recording technology. [19][20][21][22] However, these approaches require additional components, such as new optical heads, or disc fabrication processes.…”