Abstract
In this paper, a broadband terahertz metasurface dedicated to cross-polarization conversion was designed, fabricated, and assessed. The metasurface, comprising two nested double-split rings, features an inherent insensitivity to the angle of incidence. Simulations reveal that the converter achieves a ${\gt}{99}\%$ polarization conversion efficiency across the 90–140 GHz range. Moreover, it maintains a ${\gt}{90}\%$ polarization conversion ratio (PCR), even at a 50° incidence angle. The sample, featuring ${50} \times {70}$ arrays, was fabricated, and the relevant experimental results align closely with the simulated outcomes. The metasurface characteristics can markedly enhance the performance of cross-polarization converters operating in the terahertz range.
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