High density optical disk system using a new two-element lens and a thin substrate disk

F. Maeda, K. Osato, I. Ichimura, Kenji Yamamoto, A. Fukumoto, Toshio Watanabe, Mitsuo Naito, S. Masuhara
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Abstract

The areal density of an optical storage disk can be increased by improving the transverse resolution of the optical head which is proportional to λ/NA. In order to improve the resolution, a lot of research has been carried out to develop shorter wavelength light sources such as green or blue SHG lasers1,2) and recently ZnSe or GaN semiconductor blue lasers3). These lasers will soon become commercially available. On the other hand, it is difficult to make a high NA objective using a single molded aspherical element. Furthermore the higher the numerical aperture, the less the tolerance for variations in disk thickness, disk tilt, and focusing which are inversely proportional to the fourth, third, and second power of the numerical aperture, respectively. Other experiments have been carried out to improve the resolution using near-field optics4) such as scanning probes which can improve the areal density drastically, however, such probes seem to be tolerated only for working distances of around 100 nm.
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高密度光盘系统采用新型双元透镜和薄基板光盘
通过提高与λ/NA成正比的光头横向分辨率,可以提高光盘的面密度。为了提高分辨率,人们进行了大量的研究,以开发更短波长的光源,如绿色或蓝色SHG激光器1,2)和最近的ZnSe或GaN半导体蓝色激光器3)。这些激光器将很快商业化。另一方面,使用单一的非球面模制元件很难制造出高NA目标。此外,数值孔径越大,光盘厚度、光盘倾斜和聚焦变化的容错越小,这三者分别与数值孔径的四次、三次和二次成反比。为了提高分辨率,人们还进行了其他实验,比如使用扫描探针,这种近场光学技术可以大幅提高面密度,然而,这种探针似乎只能在100纳米左右的工作距离内使用。
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