孔径型超分辨近场结构光盘的电磁场分析

采用三维时域有限差分（3D-FDTD）方法建立了孔径（TA）型超分辨近场结构（super-RENS）光盘的电磁场计算模型。计算中，用矢量基模高斯光束模型作为聚焦光束的近似，用Lorentz模型描述掩膜介质Sb和反射层介质A1在光频段的色散特性。对写入和读出过程中的电场分布进行了理论分析，并与普通CD-R／W光盘进行了比较。理论计算结果很好地说明了TA型super-RENS光盘写入和读出时的电场分布特性，从本质上解释了超分辨率读写的机制，得到了和实验一致的结果。

Electromagnetic Field Analysis for TA Type Super-RENS in Optical Storages

A calculation model of electromagnetic field of transmitted-aperture(TA) type super-resolution near-field structure(super-RENS) disk based on three-dimensional finite-difference time-domain(3D-FDTD) method and a vector method of Gaussian beam was presented.Lorenz dispersive model was employed for mask layer material Sb and reflective layer material A1.The distributions of electric field for TA type super-RENS during writing and reading process were theoretically analyzed,as well as that of traditional CD-R/W.The calculation results described the electric field properties of TA type super-RENS and discovered the fundamentals of super-resolution essentially.The theoretical results were satisfied with the experiments very well.