Dual-polarity plasmonic metalens for visible light.

Dual-polarity plasmonic metalens for visible light.
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用于可见光的双极性等离子体超透镜

DOI:
10.1038/ncomms2207
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发表时间:
2012
影响因子:
16.6
通讯作者:
--
中科院分区:
综合性期刊1区
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--
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表面形貌和折射率分布决定了透镜的确定性功能。到目前为止报道的大多数透镜的极性,即正(凸)或负(凹),取决于界面的曲率。在这里,我们实验证明了一个反直观的双极性平面透镜的螺旋度依赖的相位不连续的圆偏振光的基础上。具体地,通过控制输入光的螺旋度,在一个相同的平面透镜中正负极性是可互换的。螺旋度可控的真实的和虚拟的焦平面,以及放大和缩小的成像,观察在相同的等离子体透镜在可见光和近红外波长。具有双极性的等离子体超透镜可以在螺旋度相关的聚焦和成像设备、基于角动量的量子信息处理和集成纳米光电子学中进行高级研究和应用。
Surface topography and refractive index profile dictate the deterministic functionality of a lens. The polarity of most lenses reported so far, that is, either positive (convex) or negative (concave), depends on the curvatures of the interfaces. Here we experimentally demonstrate a counter-intuitive dual-polarity flat lens based on helicity-dependent phase discontinuities for circularly polarized light. Specifically, by controlling the helicity of the input light, the positive and negative polarity are interchangeable in one identical flat lens. Helicity-controllable real and virtual focal planes, as well as magnified and demagnified imaging, are observed on the same plasmonic lens at visible and near-infrared wavelengths. The plasmonic metalens with dual polarity may empower advanced research and applications in helicity-dependent focusing and imaging devices, angular-momentum-based quantum information processing and integrated nano-optoelectronics.
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