High Density Near Field Optical Disc System

Fabrication and Characterization of Sub-100 µm Diameter Gallium Phosphide Solid Immersion Lens Arrays

“…As the data storage industry searches for methods to increase data density, systems that employ solid immersion lens (SIL) technology are under serious investigation. 1,2) The SIL increases data density by reducing spot size s ¼ =ðn sin Þ, where is the wavelength in air, n is the SIL's refractive index and is the marginal ray angle inside the SIL. In the case of common glass SILs, the maximum index of refraction is limited to around n ¼ 2:0.…”

Acousto-Optic Parallel Read/Write Head for Optical Disk Data Storage

“…Optical data storage is inherently attractive for removable storage applications since, in contrast to magnetic media, the read͞write head does not need to be in close proximity to the storage layer. 1 While the surface density of optical data storage is currently lower than magnetic storage, recent demonstrations of 112 Gbit capacity per read͞write disk 2 show the potentially large capacity of single removable disks. In combination with the random-access capability of the disk format, this makes optical storage a potential solution for large libraries.…”

“…(Color online) Trends of commercial and laboratory optical storage systems. [2][3][4][5][6][7] Recent near-field demonstrations have fallen below the expected transfer rate typically due to limitations of the gap servo system, which is still in development. The error bars on the holographic data storage (HDS) points correspond to different read and write transfer rates, which are not necessarily the same in this technology.…”

Multiplexed Optical Data Storage

“…The next generation of optical data storage solution has frequently been predicted t o be decided between truly volumetric (e-g. holographic) methods [ I ] and near-field (solid immersion lens -511) solutions [2]. Of these methods the latter one still uses a traditional "resolution" improvement technique (i.e.…”