LOCALIZED SURFACE PLASMONS FOR OPTICAL DATA STORAGE BEYOND THE DIFFRACTION LIMIT
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.
KeywordsDiffraction Limit Silver Oxide Super Resolution Optical Data Storage Recording Layer
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