Jpn. J. Appl. Phys. 46 (2007) pp. 3894-3897  |Previous Article| |Next Article|  |Table of Contents|
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Towards a Multi-Layer Near-Field Recording System: Dual-Layer Recording Results

Jack M. A. van den Eerenbeemd, Dominique M. Bruls, Coen A. Verschuren, Bin Yin, and Ferry Zijp

(Received November 20, 2006; accepted January 23, 2007; published online June 22, 2007)

We advocate the use of a polymeric cover layer for protecting the data layer and the tip of the solid immersion lens in near-field optical recording system. With a cover on top of the data layer, the numerical aperture (NA) of the objective lens is limited to the refractive index of the cover material. This means that the maximum attainable NA of cover-incident near-field systems and therefore the maximum achievable storage density is lower compared to that for first surface systems. This lower storage capacity per layer can be more than compensated for by using multiple data layers which is not possible in first-surface systems with bare discs. In this paper we present first experimental results for near-field recording with a solid immersion lens that focuses through a cover layer and a spacer layer onto a data layer, as in a dual-layer near-field disc.

URL: http://jjap.jsap.jp/link?JJAP/46/3894/
DOI: 10.1143/JJAP.46.3894

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