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Circular Polarization Analyzer Based on the Combined Coaxial Archimedes' Spiral Structure

机译：基于组合阿基米德螺旋结构的圆偏振分析仪

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摘要

We have designed a novel plasmonic lens for the circular polarization analyzer based on the combined coaxial Archimedes' spiral structure which is composed of a Archimedes' spiral slit (ASS) surrounded by coaxial Archimedes' spiral gratings (ASG) on the both sides of the metal film. The designed structure is sensitive to polarization of the incident circularly polarized light, and it can realize the focusing effect under circular polarization illumination with specific handedness and defocusing effect under the other handed circular polarization illumination. This phenomenon of spin-dependent intensity distribution can be attributed to the presence of geometric phase effect of ASS. The simulated results show that the combination of the ASS and ASG has a higher efficiency and better performance than the traditional pure ASS.
机译：我们基于组合的阿基米德同轴螺旋结构设计了一种用于圆偏振分析仪的新型等离子透镜，该结构由金属两侧的阿基米德螺旋狭缝（ASS）和同轴阿基米德螺旋光栅（ASG）包围而组成电影。设计的结构对入射的圆偏振光的偏振敏感，可以在具有特定手性的圆偏振照明下实现聚焦效果，而在另一手圆偏振照明下可以实现散焦效果。这种自旋相关强度分布的现象可以归因于ASS的几何相位效应的存在。仿真结果表明，与传统的纯ASS相比，ASS与ASG的结合具有更高的效率和更好的性能。

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