Optical super-oscillatory phenomena, coming from the delicate interference of the propagating light through an elaborate-designed structure, have been successfully applied to realize far-field focusing and imaging with a resolution beyond the diffraction limit. However, most reported super-oscillatory lenses only modulate either the amplitude or phase of the incident light. Here, a reflective plasmonic super-oscillatory metasurface (RSOM), made of aluminum-nanorods/glass-spacer-layer/aluminum-mirror, is proposed to simultaneously engineer a desired amplitude and phase profile of the incoming light and realize far-field sub-diffraction focusing. The used reflective configuration with a high polarization conversion can be helpful to concentrate more energy into the super-oscillatory spot. Sub-diffraction hotspots are further numerically verified and precisely formed at the preset plane. The compressed spot sizes for one RSOM are 0.666 and 0.714 times the diffraction limit along th...

中文翻译：

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反射等离子超振荡超表面，同时具有相位和振幅控制，可进行亚衍射聚焦

光学超级振荡现象来自传播光通过精心设计的结构产生的微妙干涉，已成功应用于实现远场聚焦和成像，分辨率超出衍射极限。然而，大多数报道的超级振荡透镜仅调制入射光的幅度或相位。在此，提出了一种由铝纳米线/玻璃间隔层/铝镜制成的反射型等离子体超振荡超表面（RSOM），以同时设计入射光的所需幅度和相位分布并实现远场子-衍射聚焦。使用的具有高偏振转换的反射配置有助于将更多的能量集中到超振荡点。次衍射热点将在预设平面上进行进一步的数值验证和精确形成。一个RSOM的压缩光斑尺寸是沿该方向的衍射极限的0.666和0.714倍。