Scattered beam control of encoded metasurface based on near-field coupling effects of elements

Tianqi Zhao; Peng Zhang; Bo Fang; Chenxia Li; Zhi Hong; Ying Tang; Mingzhou Yu; Xufeng Jing

doi:10.1016/j.saa.2023.123535

Scattered beam control of encoded metasurface based on near-field coupling effects of elements

Spectrochim Acta A Mol Biomol Spectrosc. 2024 Jan 15:305:123535. doi: 10.1016/j.saa.2023.123535. Epub 2023 Oct 14.

Authors

Tianqi Zhao¹, Peng Zhang¹, Bo Fang², Chenxia Li¹, Zhi Hong³, Ying Tang¹, Mingzhou Yu⁴, Xufeng Jing⁵

Affiliations

¹ Institute of Optoelectronic Technology, China Jiliang University, Hangzhou 310018, China.
² College of Metrology & Measurement Engineering, China Jiliang University, Hangzhou 310018, China.
³ Centre for THz Research, China Jiliang University, Hangzhou 310018, China.
⁴ College of Science, China Jiliang University, Hangzhou 310018, China. Electronic address: yumingzhoucjlu@163.com.
⁵ Institute of Optoelectronic Technology, China Jiliang University, Hangzhou 310018, China; Centre for THz Research, China Jiliang University, Hangzhou 310018, China. Electronic address: jingxufeng@cjlu.edu.cn.

PMID: 37862839
DOI: 10.1016/j.saa.2023.123535

Abstract

The coupling effect between the element structures of the traditional Huygens metasurface is easy to cause the efficiency of the designed functional devices to be reduced. In order to eliminate or reduce the coupling effect between the element structures, a border-type Huygens metasurface element structure is proposed. In order to confirm that the bounding element structure can significantly reduce the coupling effect, the near-field distribution and far-field properties of two Huygens metasurfaces with and without bounding are compared. Through comparative analysis, we find that the bounding Huygens element structure can significantly reduce the coupling effect between the element structures, and the far-field scattering angle is more consistent with the theoretical calculation value. In order to realize the free regulation of the far-field scattering angle of THz waves, we introduce the Fourier convolution principle in digital signal processing, and operate the element sequence of Huygens metasurface on the addition principle to realize the free regulation of scattered beams. In addition, we performed functional addition operations on the bounding and unbounding coding sequences. The bounding code structure can accurately achieve the synthesis of functions.