| Citation: | FU Zong-tao, YANG Fan, WANG Shao-na, LI Kai, JIANG Yue, GUO Cui-juan, NIU Ping-juan, YAO Jian-quan, SHI Jia. Design and optimization of all-dielectric focusing metasurface antennas[J]. Chinese Optics. doi: 10.37188/CO.2025-0094
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Limited by the diffraction limit, the spatial resolution of traditional microwave antennas is difficult to break through the constraint of the wavelength scale, which hinders their application in high-resolution microwave sensing and detection. In this paper, we design an all-dielectric integrated meta-antenna beyond the physical diffraction limit. Firstly, the meta-antenna is functionalized using asymmetric scattering metagrating array based on the generalized Snell's law. High-efficiency focusing beam in the sub-wavelength scale is obtained by manipulating the electromagnetic wavefront. Then, by optimizing the geometric structure of the metagrating to achieve high manipulation efficiency. Finally, the electric field intensity distribution of the generated focal spot is analyzed. The simulation results demonstrate that the manipulation and diffraction efficiencies of the metalens reach 98.50% and 72.56%. The metalens shows a focal spot with the diameter of 0.73λ and depth of focus (DOF) of 15.11λ. The designed meta-antennas possess the characteristics of long focal depth and high efficiency. Its sub-wavelength focusing property significantly enhances the spatial resolution, which provides a new method for high-precision sensing and detection in the fields such as microwave imaging and non-destructive testing, possessing potential application value.
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