An ultrathin and flexible terahertz electromagnetically induced transparency-like metasurface based on asymmetric resonators

IF 1.5 Q4 MATERIALS SCIENCE, MULTIDISCIPLINARY
Shohreh Nourinovin, SaeJune Park, Q. Abbasi, A. Alomainy
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引用次数: 0

Abstract

Terahertz (THz) electromagnetically induced transparency-like (EIT-like) metasurfaces have been extensively explored and frequently used for sensing, switching, slow light, and enhanced nonlinear effects. Reducing radiation and non-radiation losses in EIT-like systems contributes to increased electromagnetic (EM) field confinement, higher transmission peak magnitude, and Q-factor. This can be accomplished by the use of proper dielectric properties and engineering novel designs. Therefore, we fabricated a THz EIT-like metasurface based on asymmetric metallic resonators on an ultra-thin and flexible dielectric substrate. Because the quadruple mode is stimulated in a closed loop, an anti-parallel surface current forms, producing a transparency window with a transmission peak magnitude of 0.8 at 1.96 THz. To control the growing trend of EIT-like resonance, the structure was designed with four asymmetry levels. The effect of the substrate on the resonance response was also explored, and we demonstrated experimentally how the ultra-thin substrate and the metasurface asymmetric novel pattern contributed to higher transmission and lower loss.
一种基于非对称谐振腔的超薄柔性太赫兹电磁诱导透明超表面
太赫兹(THz)电磁感应类透明(EIT-like)超表面已被广泛探索,并经常用于传感、开关、慢光和增强非线性效应。在类似eit的系统中,减少辐射和非辐射损失有助于增加电磁(EM)场约束,提高传输峰值幅度和q因子。这可以通过使用适当的介电特性和工程新颖的设计来实现。因此,我们在超薄柔性介质衬底上制备了基于非对称金属谐振腔的类太赫兹eit超表面。由于四重模式在闭环中被激发,形成反平行表面电流,在1.96太赫兹处产生透射峰幅度为0.8的透明窗口。为了控制类eit共振的增长趋势,设计了四层不对称结构。我们还探讨了衬底对共振响应的影响,并通过实验证明了超薄衬底和超表面不对称的新型图案如何有助于提高透射率和降低损耗。
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来源期刊
EPJ Applied Metamaterials
EPJ Applied Metamaterials MATERIALS SCIENCE, MULTIDISCIPLINARY-
CiteScore
3.10
自引率
6.20%
发文量
16
审稿时长
8 weeks
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