Two-Dimensional Terahertz Beam Steering Based on Trajectory Deflection of Leaky-Mode
Two-Dimensional Terahertz Beam Steering Based on Trajectory Deflection of Leaky-Mode
复制标题
基于漏模轨迹偏转的二维太赫兹光束转向
DOI：
10.1109/tthz.2021.3108392
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发表时间：
2021
影响因子：
3.2
通讯作者：
Monnai Yasuaki
中科院分区：
文献类型：
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作者：
Sato Kazuto;Monnai Yasuaki
太赫兹波的自由空间传输为超越5G/6 G范式的无线通信和传感提供了巨大的机会。然而，太赫兹传输由于比微波更短的波长而遭受严重的衍射损耗。为了补偿衍射损失，定向光束的点对点传输是必不可少的。然而，实现太赫兹波束转向仍然是具有挑战性的，主要是由于缺乏实用的移相器。为了规避这一挑战，我们展示了一种新的战略的二维（2-D）太赫兹光束转向的基础上的轨迹偏转的泄漏模式在300 GHz左右。我们使用一对金属板与网格表面，其中的相速度超过光速在自由空间。漏模可以通过频率扫描控制的相位匹配条件垂直转向，并且通过板的小倾斜控制的渐变折射率水平转向。结果证实了2-D波束转向不依赖于移相器。
Free-space transmission of terahertz waves open great opportunities for wireless communication and sensing in the Beyond 5G/6G paradigm. Nevertheless, terahertz transmission suffers from severe diffraction losses due to the shorter wavelengths than the microwaves. To compensate for the diffraction losses, point-to-point transmission by directional beams is indispensable. However, implementing terahertz beam steering is still challenging due mainly to the lack of practical phase shifters. To circumvent this challenge, we demonstrate a novel strategy of two-dimensional (2-D) terahertz beam steering based on trajectory deflection of leaky-mode at around 300 GHz. We use a pair of metal plates with a mesh surface, in which the phase velocity exceeds the light speed in free-space. The leaky-mode can be steered vertically by a phase matching condition controllable with frequency sweep and horizontally by graded refractive index controllable with small tilt of the plate. The result confirms 2-D beam steering without relying on phase shifters.