Optical data storage has been closing to the diffraction limit. Since CD was developed and commercialized, everybody has never believed that the systems reach the ultimate limitation in the near future. In order to overcome and avoid the collapse, many studies have been proposed and examined, such as using magnetic and optical super-resolution, multi-level recording, three-dimensional recording, near-field recording and so on. However, most of all studies have not yet found the best solution towards data densities of 100 Gbits/inch{sup}2 and further more.
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