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arXiv 1609.07552physics.optics
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用于线偏振光非线性结构的手征惠更斯超颖表面

Chiral Huygens metasurfaces for nonlinear structuring of linearly polarized light

A. Calà Lesina, P. Berini, L. Ramunno

摘要:

我们报告了一种手性纳米结构,我们称之为“蝴蝶纳米天线”,当用于超颖表面时,允许将线性偏振光束直接转换为任意复杂度的非线性光学远场。蝶形纳米天线在其间隙中对于每个入射线性偏振都表现出场增强,这可以被用来驱动间隙内的非线性光学发射器,用于在线性等离子体不可访问的频率范围内结构化光。由于间隙中的场的偏振、相位和振幅是高度受控的,因此间隙中的非线性发射器表现为理想化的惠更斯源。因此,提出了一种通用框架,其中蝶形纳米天线可以布置在表面上以产生具有高纯度的高度结构化的远场非线性光束。一个第三谐波拉盖尔-高斯光束携带的光学轨道角动量为41的演示作为一个例子,通过大规模的模拟上的高性能计算平台的全等离子体元表面的面积大到足以容纳多达3600个纳米天线。

英文摘要:

We report on a chiral nanostructure, which we term a "butterfly nanoantenna," that, when used in a metasurface, allows the direct conversion of a linearly polarized beam into a nonlinear optical far-field of arbitrary complexity. The butterfly nanoantenna exhibits field enhancement in its gap for every incident linear polarization, which can be exploited to drive nonlinear optical emitters within the gap, for the structuring of light within a frequency range not accessible by linear plasmonics. As the polarization, phase and amplitude of the field in the gap are highly controlled, nonlinear emitters within the gap behave as an idealized Huygens source. A general framework is thereby proposed wherein the butterfly nanoantennas can be arranged on a surface to produce a highly structured far-field nonlinear optical beam with high purity. A third harmonic Laguerre-Gauss beam carrying an optical orbital angular momentum of 41 is demonstrated as an example, through large-scale simulations on a high-performance computing platform of the full plasmonic metasurface with an area large enough to contain up to 3600 nanoantennas.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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