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FDTD方法对固体浸没透镜的光场分析
引用本文:张东玲,白永林,冯晓强,贺锋涛,赵勃,侯洵.FDTD方法对固体浸没透镜的光场分析[J].光子学报,2004,33(7):884-888.
作者姓名:张东玲  白永林  冯晓强  贺锋涛  赵勃  侯洵
作者单位:1. 河南大学物理与信息光电子学院,河南开封,475001;中国科学院西安光学精密机械研究所,瞬态光学技术国家重点实验室,西安,710068
2. 中国科学院西安光学精密机械研究所,瞬态光学技术国家重点实验室,西安,710068
3. 西安交通大学电子科学与技术系,西安710049
4. 河南大学物理与信息光电子学院,河南开封,475001;中国科学院西安光学精密机械研究所,瞬态光学技术国家重点实验室,西安,710068;西安交通大学电子科学与技术系,西安710049
摘    要:采用二维时域有限差分(2D-FDTD)方法研究了高斯光束通过固体浸没透镜(SIL)的光场分布特性.模拟结果表明,SIL的折射率越大,底面出射的光斑越小,但随离底面距离的增大光束很快展宽;当只有入射角大于全反射临界角、具有高空间频率的部分高斯光束聚焦到SIL底面金属膜中心的微孔时,针对不同直径的微孔,模拟了出射光场的分布,发现微孔直径在某一特定值时,出射光斑半径在距SIL底面近半个波长范围内无明显改变,该结果为增大SIL和存储介质间距的方案提供了理论依据.

关 键 词:时域有限差分法  固体浸没透镜  近场光场  隐失场
收稿时间:2003-07-07
修稿时间:2003年7月7日

Analysis of the Optical Field of Solid Immersion Lens by FDTD


.Analysis of the Optical Field of Solid Immersion Lens by FDTD[J].Acta Photonica Sinica,2004,33(7):884-888.
Authors:

Institution:(1 College of Physics &; Information Photoelectronics, Henan University, Kaifeng 475001)
(2 State Key Lab of Transient Optics and Technology, Xi′an Institute of Optics &; Precision Mechanics, Academia Sinica, Xi′an 710068)
(3 Department of Electronic Science and Technology, Xi′an Jiaotong University, Xi′an 710049)
Abstract:Using two-dimensional finite-difference time-domain (FDTD) method, the optical fields of solid immersion lens are studied when illuminated by focusing gauss beam. The simulated results reveal that the higher the refractive index is, the smaller the beam radius on the bottom of the SIL will be, and transmitted beam expands quickly from the bottom of SIL. When only allows the total internal reflection beams focus on the small aperture, which is formed at the center of metal film coated on the bottom of SIL, the optical fields propagated from the aperture of different dimension is simulated. It turns out that the beam radius increases more slowly within half of the wavelength in specified aperture size, and which indicates that it is possible to increase the distance between the recording layer and SIL without decreasing the recording density.
Keywords:Finite-difference time-domain method  Solid immersion lens  Near-field optical field  Evanescent field
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