Coding metasurfaces have emerged as a promising venue for terahertz (THz) beam steering and beamforming. In this study, we designed a transmission metasurface with a complementary structure based on Babinet's principle. The beam-steering capability of the coding metasurface is implemented by encoding “0” and “1” elements with different phase responses and by controlling the coding sequences. The deflection angle can be controlled by changing the period of these 0 and 1 elements. Despite the development of beam-steering technology, measurements of the direction pattern of steered THz beams remain challenging. Systems for THz time-domain spectroscopy and spectral imaging are used to characterize the flexible coding metasurfaces. The THz imaging system can provide information on the directional pattern of the beam. To verify the performance of the proposed metasurface, the experimental measurements of beam deflection were found to be consistent with the values yielded by a simulation. Our study provides an effective platform for the design and measurement of THz beam steering.

中文翻译：

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挠性太赫兹编码超表面的光谱成像

编码超表面已经成为太赫兹（THz）波束控制和波束成形的有前途的场所。在这项研究中，我们基于巴比涅原理设计了具有互补结构的透射超表面。通过对具有不同相位响应的“ 0”和“ 1”元素进行编码并控制编码序列，可以实现编码超表面的波束控制能力。可以通过改变0和1元素的周期来控制偏转角。尽管波束控制技术得到了发展，但是对转向太赫兹波束方向图的测量仍然具有挑战性。用于太赫兹时域光谱和光谱成像的系统用于表征灵活的编码超表面。太赫兹成像系统可以提供有关光束方向图的信息。为了验证所提出的超颖表面的性能，发现束偏转的实验测量结果与模拟得出的值一致。我们的研究为太赫兹光束转向的设计和测量提供了有效的平台。