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首页> 外文期刊>Physical review >Broadband plasmonic device concentrating the energy at the nanoscale: The crescent-shaped cylinder
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Broadband plasmonic device concentrating the energy at the nanoscale: The crescent-shaped cylinder

机译：宽带等离子设备将能量集中在纳米级：新月形圆柱体

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Alexandra Aubry;Dang Yuan Lei;Stefan A. Maier;J. B. Pendry;%A new strategy has been proposed recently to design broadband plasmonic nanostructures capable of a significant nanofocusing of light. Applying a singular conformal transformation to a thin slab of metal, a cylinder with a crescent-shaped cross section is obtained. In this study, the corresponding theory is derived analytically and different physical insights are provided to analyze the broadband light harvesting and nanofocusing properties of this device. The optical response of the crescent is deduced by solving the metal-slab problem. The nanostructure is shown to exhibit a continuous absorption cross section which redshifts for thin crescents due to a decrease of the surface plasmon velocity. The field enhancement induced by the nanostructure is also derived analytically. The nanofocusing performance is shown to result from a balance between dissipation losses and surface-plasmons velocity. This implies a strong dependence of the field enhancement on the frequency and the crescent geometry. Numerical simulations have also been performed to investigate the effect of radiative losses when the structure dimension becomes comparable to the wavelength. Radiative damping makes the absorption cross section saturate at the level of the physical cross section. The field enhancement decreases with the size of the device. The crescent structure is shown to be quite robust to radiation losses, which opens perspectives for applications such as single-molecule detection.
机译：亚历山德拉·奥布里（Alexandra Aubry），党元磊（Dang Yuan Lei），斯特凡·A·迈尔（Stefan A. B. Pendry;％最近提出了一种新策略来设计能够对光进行显着纳米聚焦的宽带等离子体纳米结构。将奇异的共形变换应用于薄金属板，可获得具有月牙形横截面的圆柱体。在这项研究中，通过分析得出了相应的理论，并提供了不同的物理见解来分析该设备的宽带光收集和纳米聚焦特性。通过解决金属平板问题可以推断出月牙的光学响应。纳米结构显示出连续的吸收截面，由于表面等离激元速度的降低，该截面对于新月形来说是红移的。纳米结构引起的场增强也可以通过分析得出。纳米聚焦性能显示为耗散损耗和表面等离子体激元速度之间的平衡。这意味着场增强强烈依赖于频率和新月形几何形状。当结构尺寸变得与波长相当时，还进行了数值模拟以研究辐射损耗的影响。辐射阻尼使吸收截面在物理截面的水平上达到饱和。场增强随设备尺寸的增加而减小。新月形结构显示出对辐射损失非常坚固的特性，这为单分子检测等应用打开了视野。

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