用于光学近场图形化的平面非周期阵列超颖表面
Planar Aperiodic Arrays as Metasurfaces for Optical Near-Field Patterning
摘要：
等离子体超颖表面已经产生了使用纳米结构化平面金属或电介质表面的平面光学器件的领域，其可以取代庞大的光学元件并增强传统远场光学器件的能力。此外，平面光学器件的潜力可以远远超出远场调制，并且可以用于近场本身的功能。在这里，我们设计的超颖表面的基础上非周期性阵列的等离子体金纳米结构的定制的光学近场在可见光和近红外光谱范围内。阵列的基本元件是菱形，其在尺寸、取向和位置上被调制以实现微米尺寸超颖表面结构的期望功能。利用双光子光致发光作为探测超颖表面平面内近场分布的工具，我们演示了通过远场照明将光塑造成不同的近场强度图案和主动图案控制。有限元方法模拟表明，近场调制发生通过的菱形和场增强的纳米级的元素之间的间隙中的等离子体共振的组合。该方法使得光学元件能够经由入射远场光的波长和偏振切换跨超颖表面的近场分布，并且为集成器件中的光物质相互作用提供路径。
英文摘要：
Plasmonic metasurfaces have spawned the field of flat optics using nanostructured planar metallic or dielectric surfaces that can replace bulky optical elements and enhance the capabilities of traditional far-field optics. Furthermore, the potential of flat optics can go far beyond far-field modulation, and can be exploited for functionality in the near-field itself. Here, we design metasurfaces based on aperiodic arrays of plasmonic Au nanostructures for tailoring the optical near-field in the visible and near-infrared spectral range. The basic element of the arrays is a rhomboid that is modulated in size, orientation and position to achieve the desired functionality of the micron-size metasurface structure. Using two-photon-photoluminescence as a tool to probethe near-field profiles in the plane of the metasurfaces, we demonstrate the molding of light into different near-field intensity patterns and active pattern control via the far-field illumination. Finite element method simulations reveal that the near-field modulation occurs via a combination of the plasmonic resonances of the rhomboids and field enhancement in the nanoscale gaps in between the elements. This approach enables optical elements that can switch the near-field distribution across the metasurface via wavelength and polarization of the incident far-field light, and provides pathways for light matter interaction in integrated devices.
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