A vanadium dioxide-based multilayer metamaterial is proposed with bifunctional properties of absorption and polarization conversion. When vanadium dioxide is in the metallic state, the designed system behaves as a single-band absorber which is composed of a vanadium dioxide disk-shaped array, a silica spacer, and a vanadium dioxide continuous film. The performance of absorption can be tuned by changing either the diameter of disk or the thickness of silica. The design of this absorber is robust against incident polarization and incident angle. The proposed single-band absorber may be generally applied for plasmonic detection, cavity resonator, and optical band-stop filter. When vanadium dioxide is in the insulating state, the designed system behaves as a cross polarization converter which mainly consists of a one-dimensional metallic strip-shaped array, a silica spacer, and a metallic continuous film. The designed metamaterial can convert a linear plane wave into its corresponding cross-polarized wave with the efficiency of >90% in the frequency of 2.0-3.0 THz. The physical mechanism of polarization conversion is explained by a simple picture. The proposed metamaterial could be a potential candidate for the modern device of polarization control.

中文翻译：

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用于太赫兹波的基于二氧化钒的双功能超材料

提出了一种基于二氧化钒的多层超材料，具有吸收和偏振转换的双功能特性。当二氧化钒处于金属态时，所设计的系统表现为由二氧化钒圆盘状阵列、二氧化硅间隔物和二氧化钒连续薄膜组成的单波段吸收体。可以通过改变圆盘的直径或二氧化硅的厚度来调整吸收性能。这种吸收器的设计对入射偏振和入射角具有鲁棒性。所提出的单波段吸收器通常可用于等离子体检测、腔谐振器和光学带阻滤波器。当二氧化钒处于绝缘状态时，设计的系统表现为交叉偏振转换器，主要由一维金属条形阵列、二氧化硅间隔物和金属连续薄膜组成。设计的超材料可以将线性平面波转换为其相应的交叉极化波，在 2.0-3.0 THz 频率下的效率 >90%。偏振转换的物理机制可以用一张简单的图片来解释。所提出的超材料可能是现代偏振控制设备的潜在候选者。