Reflectionless zero refractive index metasurface in the terahertz waveband
Reflectionless zero refractive index metasurface in the terahertz waveband
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DOI：
10.1364/oe.395223
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发表时间：
2020-07-20
期刊：
影响因子：
3.8
通讯作者：
Asada, Harumi
中科院分区：
文献类型：
--
作者：
Suzuki, Takehito;Asada, Harumi
由于电磁波以无限大的相速度传播，零折射率材料在有限尺寸下表现为单点。然而，天然材料的组成不能产生零折射率材料，因为介电和磁性质的任何影响都必须消失（接近于零）。在本报告中，我们展示了零折射率超表面，折射率为0.16 + j0.09，反射率为0.7%，透射率为97.3%。在0.505 THz下测得的相对介电常数和相对渗透率分别为0.18 - j0.10和0.004 + j0.16。在同一频率下，相对介电常数和相对磁导率同时趋近于零，并且在人工材料中，介电和磁性能似乎不存在（消失）。零折射率超表面可以为太赫兹应用提供一个材料平台，具有前所未有的6G（超5G）无线通信、成像和安全功能。(C) 2020年美国光学学会根据OSA开放获取出版协议的条款
Zero refractive index materials behave electromagnetically as single points despite the finite dimensions because a propagating electromagnetic wave passes with an infinite phase velocity. However, the composition of naturally occurring materials cannot produce a zero refractive index material because any effect of both of the dielectric and magnetic properties would have to vanish (be near zero). In this report, we demonstrate a zero refractive index metasurface with a refractive index of 0.16 + j0.09, the reflectance of 0.7%, and transmittance of 97.3% at 0.505 THz. The measured relative permittivity and relative permeability are 0.18 - j0.10 and 0.004 + j0.16 at 0.505 THz, respectively. Both the relative permittivity and relative permeability simultaneously approach zero at the same frequency, and the dielectric and magnetic properties appear to be absent (vanish) in the artificial material. The zero refractive index metasurface can offer a material platform for terahertz applications with unprecedented functionalities for 6G (beyond 5G) wireless communications, imaging, and security. (C) 2020 Optical Society of America under the terms of the OSA Open Access Publishing Agreement