Precise Formation of Fine Pits on Birefringent Film for Multilevel Optical Data Storage

概要

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In the current optical data storage, binary coding is used, in hich mark and null states correspond to high and low levels of reflected light. In the binary coding, the capacity of recording information can be increased by minimizing the pit size and maximizing the track density. However, the minimization of pit size will reach a limit even if near-field optics are used. To overcome this limitation, we have proposed and demonstrated multilevel optical data storage by changing the pit depths of a birefringent film. In this method, the volume of stored information can be increased without increasing the pit density. Multilevel pits with the width of 1 μm and with various depths were formed on a liquid crystalline polymer film with the birefringence of 0.20, and the phase difference between orthogonal polarizations was confirmed to be proportional to the depth of the pits.
社団法人応用物理学会の論文
2002-07-30