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本文结合狄拉克半金属(DSMs)研究了一种基于各向异性构型的可调谐宽频带太赫兹偏振转换超表面，其中的狄拉克半金属线阵列有利于费米能的调控。研究结果表明该超表面可以实现宽带高效率的偏振转换，在谐振模式处具有半波片特性。这种转换特性源于局域表面等离子体激元谐振(LSPRs)的激发和结构自身的各向异性。当入射角在0°~40°范围内变化时，能保持高效的宽带偏振转换特性，大于40°后，宽带转换逐渐转变为双带或多带转换。此外，发现AlCuFe的费米能从65 meV增大至140 meV过程中，偏振转换效率能维持在很高水平，并且转换性能由单带转换变为宽带转换再变为带较宽的宽带转换与带较窄的单带转换。同时，通过讨论结合了不同类型狄拉克半金属的超表面，得出了狄拉克半金属的金属性越好，相应超表面的宽带偏振转换性能越优的结论。最后，基于类法布里-佩罗谐振腔的多重干涉理论(MIT)对数值结果进行了验证。Combined with the Dirac semimetals (DSMs), which is a new type of material and also called as 3D graphene, a tunable wideband terahertz polarization conversion metasurface based on an anisotropic configuration is studied, in which the DSMs wire array is beneficial to the regulation of Fermi energy. The results show that the metasurface can realize wideband and highly efficient polarization conversion, and has the property of half wave plate at the resonant modes. This characteristics are derived from the excitation of Localized Surface Plasmon Resonances (LSPRs) and the anisotropy of structure itself. When the incident angle changes in the range of 0°~40°, the high efficiency of wideband polarization conversion can be maintained. When it is greater than 40°, the wideband polarization conversion gradually changes to the dual-band or the multi-band conversion. Furthermore, it is found that in the process of increasing the Fermi energy of AlCuFe from 65 meV to 140 meV, the polarization conversion ratio can be maintained at a high level, and the conversion performance changes from single-band conversion to wideband conversion, and then to wideband conversion with wider band and single-band conversion with narrower band. At the same time, by discussing the metasurface combined with the different DSMs, it is concluded that the better the metallic property of DSMs is, the better the wideband polarization conversion performance of the corresponding metasurface is. At last, the numerical results are verified by the Multiple Interference Theory (MIT) based on the Fabry-Pérot-like resonance cavity.
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Keywords:
- Terahertz tunable metasurface /
- Dirac semimetals /
- Wideband polarization conversion /
- Multiple interference theory
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