Near-Field Phase-Change Optical Recording of 1.36 Numerical Aperture
Near-Field Phase-Change Optical Recording of 1.36 Numerical Aperture
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1.36数值孔径的近场相变光学记录
DOI：
10.1143/jjap.39.962
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发表时间：
2000
影响因子：
1.5
通讯作者：
Kimihiro Saito
中科院分区：
文献类型：
--
作者：
I. Ichimura;K. Kishima;K. Osato;Kenji Yamamoto;Y. Kuroda;Kimihiro Saito
利用超球固体浸没透镜（SIL）在657nm波长下进行近场相变（PC）光记录，获得了125 nm的位元密度。镜头单元由一个标准物镜和一个φ2.5 mm的SIL组成。由于这种镜头尺寸仍然无法安装在空气轴承滑块上，因此我们开发了一个单轴定位致动器和一个主动电容伺服器，用于精确的间隙控制，以彻底研究近场记录。在SIL的底部制作电极，并在圆盘材料上形成电容器。该装置实现了50 nm以下的稳定气隙，并采用模拟调制传递函数（MTF）的新方法优化了该气隙高度下的PC盘结构。获得了8.8%的抖动和清晰的眼纹，证明系统成功地达到了设计的1.36的数值孔径。
A bit density of 125 nm was demonstrated through near-field phase-change (PC) optical recording at the wavelength of 657 nm by using a supersphere solid immersion lens (SIL). The lens unit consists of a standard objective and a φ2.5 mm SIL. Since this lens size still prevents the unit from being mounted on an air-bearing slider, we developed a one-axis positioning actuator and an active capacitance servo for precise gap control to thoroughly investigate near-field recording. An electrode was fabricated on the bottom of the SIL, and a capacitor was formed facing a disk material. This setup realized a stable air gap below 50 nm, and a new method of simulating modulation transfer function (MTF) optimized the PC disk structure at this gap height. Obtained jitter of 8.8% and a clear eye-pattern prove that our system successfully attained the designed numerical-aperture (NA) of 1.36.