Research on Multiwavelength and Multipolarization Optical Data Storage Using Nano-Structures

在这项工作中，我们研究了由金属纳米团簇组成的金属岛膜作为多波长和多极化光学数据存储介质。金属岛膜在可见光和近红外区表现出反常的共振型吸收。在共振波长处，金属岛膜不仅吸收率大，而且反射率高。由于在谐振波长附近的波长区域加热会使金属岛膜的光学特性发生很大的变化，因此可以将金属岛膜用作热模一次写入的光学数据存储介质。本文模拟了多层静脉银岛层和介电层的光谱光学变化。我们成功地证明了在500 ~ 900 nm波长区域具有4个记录层的多波长光数据存储介质是可以实现的。此外，我们还证明了利用长链银纳米团簇可以实现在350 ~ 450 nm波长范围内具有3个记录层的多波长光数据存储介质。对于多极化光学数据存储介质，我们从理论上证明了由向一侧倾斜的长金属粒子组成的倾斜金属岛膜多层材料可以作为记录介质。

In this work, we have investigated metal island films composed of metal nanoclusters as multiwavelength and multipolarization optical data storage media. The metal island films exhibit anomalous resonance-type absorption in the visible and near-infrared regions. At the resonance wavelength, metal island films not only have large absorption but also high reflectance. Because optical characteristics of metal island films are altered considerably by heating in the wavelength region near the resonance wavelength, the metal island films can be used as heat-mode write-once optical data storage media. In this work, we simulated the spectral optical change of the multilayer of venous silver island layers and dielectric layers. We successfully showed that the multiwavelength optical data storage media with 4 recording layers in the wavelength region of 500 - 900 nm could be realized. In addition, we also showed that the multiwavelength optical data storage media with 3 recording layers in the wavelength region of 350 - 450 nm could be realized by using prolate silver nanoclusters. For the multipolarization optical data storage media, we theoretically showed that the multilayers using oblique metal island films composed of prolate metal particles inclined to one side could be used as the recording media.