超高密度光存储技术

Ultra-density Optical Storage Technology

文章从三维体存储和近场光存储两个方向介绍了超高密度光存储技术。三维体存储包括:体全息数据存储、双光子吸收存储和多层存储。体全息数据存储容量大、寻址快、存储寿命长;双光子吸收存储也属于多层记录存储,存储形式多样,本文以光致色变光存储为例进行讨论。海量存储的另一个研究方向是近场光存储,该技术与传统光存储显著的区别在于:用纳米尺寸的光学探针距记录介质纳米距离实现纳米尺寸光点的记录,从而实现超高密度光存储。文章最后对超高密度光存储发展及应用趋势进行了阐述。

Ultra-density optical storage is introduced from two aspects. One is three-dimension optical storage including holographic optical storage, two-photon absorption storage and multi-layer storage. Holographic storage can record a great deal of data with ultra-density, high speed of addressing and a long life of storage. Two-photon absorption belongs to multi-layer storage, which presents various aspects, one of them photochromatic storage is introduced. Another aspect of ultra-density storage is near-field optical storage. Contrasting with the conventional far-field optical storage, the most distinctive difference is using optical probe, which is not bigger than some nanometers and the distance from storage medium is less than a few nanometers, to get a storage unit smaller than several nanometers. In the end this article also expresses the development and applications of ultra-density optical storage.