Abstract
Optical data storage technology and its storage capacity have gradually been improved over the last two decades, especially thanks to the development of shorter-wavelength semiconductor laser units and high-precision optical lithography (mastering). Currently the available storage capacity is beyond 5 GB in a 12-cm disc for DVD, and a 25 GB disc drive system with a 405-nm blue laser unit is also available as blu-ray disc or HD-DVD. However, the storage capacity has almost reached the optical limit because of far-field diffraction. At the moment, there is no alternative way to improve the laser spot size to less than 300 nm using far-field optics, even with the most advanced optical disc technology employing a 405-nm wavelength and a lens numerical aperture (NA) of 0.85.
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TOMINAGA, J. (2007). LOCALIZED SURFACE PLASMONS FOR OPTICAL DATA STORAGE BEYOND THE DIFFRACTION LIMIT. In: Brongersma, M.L., Kik, P.G. (eds) Surface Plasmon Nanophotonics. Springer Series in Optical Sciences, vol 131. Springer, Dordrecht. https://doi.org/10.1007/978-1-4020-4333-8_16
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DOI: https://doi.org/10.1007/978-1-4020-4333-8_16
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