Chen Weibin, Rui Guanghao, Abeysinghe Don C, Nelson Robert L, Zhan Qiwen
Electro-Optics Program, University of Dayton, Dayton, OH 45469, USA.
Opt Express. 2012 Nov 19;20(24):26299-307. doi: 10.1364/OE.20.026299.
A hybrid spiral plasmonic lens that consists of alternating spiral slot and spiral triangular sub-aperture array can differentiate circular polarization of different handedness and enable a miniature circular polarization analyzer design with high efficiency. The improved performance compared to pure spiral slot lens comes from the fact that the hybrid lens is capable of focusing both the radial and the azimuthal polarization components of a circular polarization, doubling the coupling efficiency. In this paper, the spin-dependent plasmonic focusing properties of a spatially arranged triangular sub-aperture array and a hybrid spiral plasmonic lens are demonstrated using a collection mode near field scanning optical microscope. The coupling efficiency could be further improved through optimizing the geometry of the hybrid lens.
一种由交替的螺旋槽和螺旋三角形子孔径阵列组成的混合螺旋等离子体透镜，能够区分不同旋向的圆偏振，并实现高效的微型圆偏振分析仪设计。与纯螺旋槽透镜相比，性能的提升源于混合透镜能够聚焦圆偏振的径向和方位角偏振分量，使耦合效率提高一倍。在本文中，利用收集模式近场扫描光学显微镜展示了空间排列的三角形子孔径阵列和混合螺旋等离子体透镜的自旋相关等离子体聚焦特性。通过优化混合透镜的几何结构，耦合效率可以进一步提高。
