Tunable broadband angular selectivity for s-polarized terahertz incidences

Tunable broadband angular selectivity for s-polarized terahertz incidences
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s 偏振太赫兹入射的可调谐宽带角度选择性

DOI:
10.1007/s00339-021-04279-1
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发表时间:
2021-01
影响因子:
2.7
通讯作者:
Dexin Ye
Dexin Ye
中科院分区:
材料科学4区
文献类型:
--
作者:
Yuan Gao;Zhongbo Zhu;Bin Zhang;Jiangtao Huangfu;Lixin Ran;Dexin Ye

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虽然实现p偏振波的宽带角度选择性已经得到了很好的研究,但s偏振波的宽带角度选择性仍然具有挑战性。原因在于,在太赫兹频谱等高频下,材料的磁导率始终趋近于1。在这里,我们提出了一个解决方案,实现宽带角选择性的s-偏振入射相结合的有效各向异性抗磁介质和交错光子结构。抗磁介质由周期性排列的金属环构成,在超宽太赫兹波段表现出可忽略的频率色散。通过在交错结构中引入温变介质,提出了一种热调谐宽带角选择性系统,选择角可调范围为0° ~ 40°。全波仿真验证了该方法的有效性,突破了现有角度选择技术的偏振限制。所提出的方法是简单的,鲁棒的,可扩展的从微波到太赫兹频率。
While achieving broadband angular selectivity for p-polarized wave has been well studied, it is still challenging for s-polarized wave. The reason is that at high frequencies such as terahertz spectrum, the permeability of materials has always approached unity. Here, we propose a solution to implement broadband angular selectivity for s-polarized incidences by combining an effective anisotropic diamagnetic medium and a staggered photonic structure. The diamagnetic medium is constructed with periodically arranged metallic rings, exhibiting negligible frequency dispersion in an ultra-wide terahertz band. By incorporating temperature-dependent dielectric into staggered structure, a thermally tunable broadband angular selectivity system is presented, with an adjustable selective angle ranging from 0° to 40°. Full-wave simulations verify the effectiveness of the proposed approach, breaking through the polarization limitation of the existing angular selectivity technology. The proposed approach is simple, robust, and scalable from microwave to terahertz frequencies.
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