Jpn. J. Appl. Phys. 43 (2004) pp. 4929-4936  |Previous Article| |Next Article|  |Table of Contents|
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Advanced Lens Design for Bit-Wise Volumetric Optical Data Storage

Yan Zhang, Tom D. Milster, Jai Soon Kim1 and Sang-Ki Park

Optical Sciences Center, University of Arizona, Tucson, Arizona 85721, U.S.A.
1School of Physics, Seoul National University, San 56-1 Sillim-Dong, Kwanak-Gu, Seoul, 151-747, Korea

(Received December 11, 2003; accepted February 24, 2004; published July 29, 2004)

The storage capacity of a fluorescent bit-wise volumetric optical data storage system is limited by the inter-layer crosstalk and the maximum compensation range of spherical aberration induced by different layers inside the medium. Lens designs of far-field and near-field optical systems suitable for volumetric storage are presented. The maximum compensation range of each design is calculated. The storage densities of far-field and near-field confocal systems in terms of bits-in-2 are derived based on the maximum compensation ranges and appropriate data layer spacings that induce a -30 dB maximum level of inter-layer crosstalk. It is shown that an optimized near-field system is able to achieve 1.65 Tb-in-2 data density.

DOI: 10.1143/JJAP.43.4929
KEYWORDS:near-field optical storage, crosstalk, signal-to-noise ratio, volumetric data storage

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