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Abstract
To meet the requirements of integrated and high-resolution focusing devices for passive millimeter-wave (PMMW) imaging systems, a polarization-multiplexed high-resolution near-field focusing metasurface lens is proposed. Metasurface units consist of two dielectric layers and three metal layers and are designed with a multiarm windmill structure. This design allows the units to independently control the electromagnetic response of incident $x$-polarized and $y$-polarized waves while maintaining a thickness of only ${0.16}\lambda$ (2 mm). The metasurface lens that can achieve dual-channel near-field focusing was designed by combining the focusing principle of the metasurface lens and phase superposition principle based on the above design. The lens consists of ${30} \times {30}$ units and has a size of ${120} \times {120}\,\,\rm mm^{2}$. According to the simulation results, the lens is able to focus the $y$-polarized waves of 24 GHz at $z = {50}\;{\rm mm}$ plane with a focal spot size of ${0.68}\lambda$ (8.5 mm), and the focusing beam efficiency is 35.2%. Similarly, the $x$-polarized waves of 24 GHz are focused at $z = {70}\;{\rm mm}$ plane with a focal spot size of ${0.72}\lambda$ (9 mm), and the focusing beam efficiency is 40.7%. The proposed metasurface lens is promising for applications in PMMW imaging systems, medical sensors, automotive millimeter-wave radar, and other related fields, owing to the characteristics of high resolution, compact size, and multifunctionality.
© 2024 Optica Publishing Group
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