A novel triple-band, tunable, high-efficiency, mid-infrared reflected cross-polarization converter based on a graphene metasurface is proposed and studied, which comprised a periodic ellipse graphene patch with a slit, a dielectric spacer, and a metal gold substrate. Numerical simulations indicate that the proposed converter can convert a linearly polarized wave to its cross-polarized wave at three resonance frequencies due to the superimposition of the two reflected components with a near 180° or 0° phase difference. The polarization conversion ratios of the three bands are 98.29%, 98.42%, and 97.64%, respectively. The polarization converter can be dynamically tuned by changing the Fermi energy. Our proposed tunable polarization converter has great potential in the application of electromagnetic polarization control.

中文翻译：

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基于带缝隙的周期性椭圆石墨烯贴片的中红外可调谐三频交叉极化转换器

提出并研究了一种新型的基于石墨烯超表面的三波段，可调，高效，中红外反射交叉极化转换器，该转换器包括带有缝隙的周期性椭圆石墨烯贴片，介电间隔物和金属金衬底。数值模拟表明，由于两个反射分量的相位差接近180°或0°，所以所提出的转换器可以在三个谐振频率下将线性偏振波转换为其交叉偏振波。这三个波段的偏振转换率分别为98.29％，98.42％和97.64％。极化转换器可以通过改变费米能量来动态调谐。我们提出的可调极化转换器在电磁极化控制的应用中具有巨大的潜力。