Centrally Symmetric Focusing of Surface Plasmon Polaritons with a Rectangular Holes Arrayed Plasmonic Lens
Centrally Symmetric Focusing of Surface Plasmon Polaritons with a Rectangular Holes Arrayed Plasmonic Lens
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矩形孔阵列等离子体透镜的表面等离子体激元的中心对称聚焦
DOI：
10.1007/s11468-016-0220-7
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发表时间：
2016-04
期刊：
影响因子：
3
通讯作者：
Sun Xiudong
中科院分区：
文献类型：
--
作者：
Huang Feng;Jiang Xiangqian;Yuan Haiming;Li Siren;Yang Hanning;Sun Xiudong
在金薄膜中蚀刻的纳米矩形孔被优化和排列以形成等离子体透镜。我们从理论和数值上证明了所提出的等离子体透镜可以将表面等离子体激元聚焦到具有空间均匀的任意偏振入射（包括线偏振、椭圆偏振和圆偏振入射）的中心对称场。中心对称的场分布与高度受限的斑点，其大小超过衍射极限实现。特别地，聚焦场的强度分布对线偏振入射光的偏振方向和椭圆偏振入射光的倾斜角不敏感。此外，焦斑的强度可以通过椭圆偏振入射光的椭圆率角来调制。右旋圆偏振入射时光强最大，是线偏振入射时光强的2倍，左旋圆偏振入射时光强为零。
Nano rectangular holes etched in a gold thin film are optimized and arrayed to form a plasmonic lens. We demonstrate both theoretically and numerically that the proposed plasmonic lens can focus surface plasmon polaritons to a centrally symmetric field with spatially homogeneous arbitrary polarization incidence, including linear, elliptical, and circular polarization incidence. Centrally symmetric field distributions with highly confined spots whose size beyond the diffraction limit are achieved. Particularly, the intensity distribution of the focused field is insensitive to the polarization direction of linearly polarized incident light and the inclination angle of elliptically polarized incident light. Moreover, the intensity of the focal spot can be modulated by the ellipticity angle of elliptically polarized incident light. The intensity is maximized for right-handed circular polarization incidence, and is twice that for linear polarization incidence, while that is null for left-handed circular polarization incidence.
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