Improving near-field confinement of a bowtie aperture using surface plasmon polaritons
Improving near-field confinement of a bowtie aperture using surface plasmon polaritons
复制标题
DOI：
10.1063/1.3595412
复制
发表时间：
2011-05-30
影响因子：
4
通讯作者：
Xu, Xianfan
中科院分区：
文献类型：
--
作者：
Srisungsitthisunti, Pornsak;Ersoy, Okan K.;Xu, Xianfan
众所周知，领结孔径可以产生高强度的亚衍射限制光斑。在这项工作中，我们研究了将领结孔径与圆形凹槽集成，以减少领结孔径产生的近场发散。数值结果表明，从圆形凹槽反射的表面波改善了领结孔径沿偏振轴的场限制。这些圆形凹槽的周期接近表面等离子体激元波长的一半，在距表面 20 至 100 nm 的距离处，光斑尺寸减少了 40%，并产生了更加对称的光斑。 (C) 2011 年美国物理研究所。 [号码：10.1063/1.3595412]
Bowtie aperture is known to produce subdiffraction-limited optical spot with high intensity. In this work, we investigate integrating a bowtie aperture with circular grooves to reduce the divergence of the near-field produced by the bowtie aperture. Numerical results indicate that surface waves reflected from circular grooves improve the field confinement of a bowtie aperture along the polarization axis. These circular grooves with period near half the wavelength of surface plasmon polaritons reduce the spot size by as much as 40% at distances between 20 and 100 nm from the surface and create a more symmetrical optical spot. (C) 2011 American Institute of Physics. [doi: 10.1063/1.3595412]