Plasmonic Metalens to Generate an Airy Beam.

Plasmonic Metalens to Generate an Airy Beam.
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DOI:
10.3390/nano13182576
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发表时间:
2023-09-17
期刊:
Nanomaterials (Basel, Switzerland)
影响因子:
--
通讯作者:
Téllez-Limón R
Téllez-Limón R
中科院分区:
其他
文献类型:
--
作者:
Sosa-Sánchez CT;Téllez-Limón R

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空气光束代表了一种重要的非衍射光--它们是一维中唯一的非衍射波,因此可以用柱面几何形状来改变一维中的波前。在这篇文章中,我们展示了一种圆柱形等离子体金属透镜的设计,它由金薄层中的纳米狭缝阵列组成,它调制高斯光束的位相以产生在自由空间中传输的空气光束。数值结果表明,只需将金纳米缝隙阵列出射的波前的位相与平面上的气体光束位相匹配,就有可能产生气体光束。我们用数值方法证明了空气光束具有弯曲传播和自愈特性。传输效率在60%左右。所提议的结构的简单性为光聚焦应用的平面变形表面的设计开辟了新的视角。
Airy beams represent an important type of non-diffracting beams—they are the only non-diffracting wave in one dimension, and thus they can be produced with a cylindrical geometry that modifies a wavefront in one dimension. In this paper, we show the design of a cylindrical plasmonic metalens consisting of an array of nanoslits in a gold thin layer that modulates the phase of a Gaussian beam to generate an airy beam propagating in free space. Based on the numerical results, we show that it is possible to generate an airy beam by only matching the phase of wavefronts coming out from the array of gold nanoslits to the airy beam phase at plane . We numerically demonstrate that the airy beam exhibits bending over propagation and self-healing properties. The transmission efficiency is around 60%. The simplicity of the proposed structure open new perspectives in the design of flat metasurfaces for light-focusing applications.
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