Theoretical study of near-field optical storage with a solid immersion lens.
Theoretical study of near-field optical storage with a solid immersion lens.
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DOI：
10.1364/josaa.23.002132
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发表时间：
2006-09
期刊：
影响因子：
--
通讯作者：
Yaoju Zhang
中科院分区：
文献类型：
--
作者：
Yaoju Zhang
同时考虑了半球固体浸没透镜内部的反射和固体浸没透镜与光记录介质之间的间隙内的反射。利用矢量衍射法和薄膜光学理论，建立了大数值孔径的近场硅胶成像理论。数值结果表明，由于透射场的干涉效应，光斑大小、斯特雷尔比和旁瓣强度随着气隙厚度的变化而变化。我们发现，对于较小的光斑尺寸，Strehl比较小，但旁瓣强度较大。一定厚度的气隙对光存储是有利的，在模拟的例子中，系统的气隙小于63 nm。
Both the reflection inside a hemisphere solid immersion lens (SIL) and the reflection inside the gap between the SIL and the optical recording medium are considered. The near-field SIL imaging theory for high numerical aperture is developed by using the vector diffraction and thin-film optics. Numerical results show that the spot size, Strehl ratio, and sidelobe intensity have an oscillatory behavior with the change of thickness of the air gap, which results from the interference effect of the transmitted field. We find that for smaller spot size, the Strehl ratio is smaller but the sidelobe intensity is larger. A certain thickness of air gap is useful for optical storage, which is less than 63 nm for the system in the simulated examples.