Composite Luneburg lens based on dielectric or plasmonic scatterers.
Composite Luneburg lens based on dielectric or plasmonic scatterers.
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DOI：
10.1364/oe.27.010946
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发表时间：
2019-04
期刊：
影响因子：
3.8
通讯作者：
Qiao Cheng;M. Naeem;Y. Hao
中科院分区：
文献类型：
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作者：
Qiao Cheng;M. Naeem;Y. Hao
我们提出了一种三维(3D)伦堡透镜设计方案，它使用非共振球面散射体作为主体介质中的夹杂物来操纵电磁波。其基本原理是夹杂散射体的体积分数可以在空间上变化，从而控制所需介电常数分布的有效介电常数。具体而言，为了获得期望的体积分数值，散射体的分布采用了简单立方体堆积、六边形紧密堆积和随机堆积的方法。提出的分析以等离子体包裹体为特征，作为介电包裹体的合理替代，以产生所需的光学介电常数的有效值。通过对用于波束控制应用的伦堡透镜(包括微波和光学)的设计和模拟，我们证明了该方案的适用性。该设计在与透镜相切的平面上实现了与偏振无关的功能，并产生了高天线增益。该方案为实现从微波到光学的许多破坏性应用提供了一种有用的手段。
We present a three-dimensional (3D) Luneburg lens design scheme that employs non-resonant spherical scatterers as inclusions in a host medium for the manipulation of electromagnetic waves. The underlying principle is that the volume fraction of the inclusion scatterers can be varied spatially so as to control the effective permittivity for the desired permittivity profile. Specifically, to achieve desired volume fraction values, simple cubic packing, hexagonal close packing and random packing methods were used for scatterer distribution. The proposed analysis features the plasmonic inclusions as a rational alternative for dielectric inclusions to produce a desired effective value of the permittivity in optics. We demonstrate the applicability of the proposed scheme by employing it to design and simulate Luneburg lens (both in microwave and optics) for beam steering applications. The design leads to polarisation independent functionality in the plane tangent to the lens and yields high antenna gain. The scheme provides a useful means to realize many disruptive applications ranging from the microwaves to optics.