A Luneburg Lens for the Terahertz Region
A Luneburg Lens for the Terahertz Region
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DOI：
10.1007/s10762-019-00635-8
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发表时间：
2019-12-01
影响因子：
2.9
通讯作者：
Mendis, Rajind
中科院分区：
文献类型：
--
作者：
Amarasinghe, Yasith;Mittleman, Daniel M.;Mendis, Rajind
我们使用基于波导的人造介电介质通过实验演示了太赫兹区域的二维吕讷堡透镜。透镜的基板材料为聚四氟乙烯，上下表面镀银，形成准平行板波导。该装置的顶面具有弯曲的圆锥形轮廓，底面是平坦的。该透镜可以将频率为 0.162 THz 的直径约 2 厘米的输入光束聚焦到设备直径相对边缘处的光斑尺寸为 3.4 毫米（小于 2 λ）。
We experimentally demonstrate a two-dimensional Luneburg lens for the THz region using a waveguide-based artificial-dielectric medium. The substrate material of the lens is Teflon with the top and bottom surfaces coated with silver to form a quasi-parallel-plate waveguide. The top surface of the device has a curved conical profile and the bottom surface is flat. The lens can focus an approximately 2-cm diameter input beam at a frequency of 0.162 THz to a spot size of 3.4 mm (less than 2 lambda) at the diametrically opposite edge of the device.