Nanofocusing of surface plasmon polaritons by a pyramidal structure on an aperture.
Nanofocusing of surface plasmon polaritons by a pyramidal structure on an aperture.
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DOI：
10.1364/oe.18.000787
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发表时间：
2010-01
期刊：
影响因子：
3.8
通讯作者：
Kazuo Tanaka;K. Katayama;Masahiro Tanaka
中科院分区：
文献类型：
--
作者：
Kazuo Tanaka;K. Katayama;Masahiro Tanaka
采用体积积分方程方法，数值研究了表面等离子体激元（SPP）通过矩形孔上的金字塔结构的纳米聚焦。可以通过使用线性偏振波作为入射波来使用该结构执行纳米聚焦。数值模拟了表面等离子体通过锥体尖端的聚焦过程。详细研究了针尖附近的聚焦光场特性。它被发现是类似的，而不是一个微小的偶极子。尖端处的光场对尖端的局部形状敏感。尖端上的增强强度随着孔径宽度的增加而增加。
A numerical study of the nanofocusing of surface plasmon polaritons (SPPs) by a pyramidal structure on a rectangular aperture is performed by the volume integral equation method. It is possible to perform nanofocusing using this structure by using a linearly polarized wave as the incident wave. The focusing process of SPPs by the tip of the pyramidal structure has been demonstrated numerically. The characteristics of the focused optical field near the tip have been investigated in detail. It was found to be similar to that of monopole rather than that of a tiny dipole. The optical field at the tip is sensitive to the local shape of the tip. The enhanced intensity on the tip increases with an increase in the aperture width.