基于层叠结构的双波段太赫兹超材料增透膜设计
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摘要
设计了一种双波段太赫兹超材料增透膜结构,该增透膜采用层叠结构,即由两层金属-聚合物构成。通过数值计算得到了两层金属-聚合物结构金属表面的电场分布,分析了两波段超低反射产生的机理,并通过优化聚合物层的厚度与金属单元结构的尺寸,实现了在0.471 THz和1.560 THz两个频点处的超低反射,反射率最低分别为0.0028和0.0025,反射率在10%以内的带宽分别为0.26 THz和0.21 THz。研究结果为实现多波段太赫兹超材料增透膜应用提供了参考。
This paper presents the design of a dual-band terahertz metamaterial antireflection coating with a multilayered structure(two layers of metal-polyimide). The formation of the two low-reflectivity bands is analyzed by numerically calculating the electric field distributions on metal surfaces of the two layer of metal-polyimide structure. After adjusting the thickness of the polyimide layer and the size of the metal unit structure, ultra-low reflectivity is achieved with the minimum percentages of 0.0028 and 0.0025 at 0.471 and 1.560 THz, respectively(with <10% reflectivity for the bandwidths of 0.26 and 0.21 THz). The results provide a reference for the applications of multi-band terahertz metamaterial antireflection coatings.
This paper presents the design of a dual-band terahertz metamaterial antireflection coating with a multilayered structure(two layers of metal-polyimide). The formation of the two low-reflectivity bands is analyzed by numerically calculating the electric field distributions on metal surfaces of the two layer of metal-polyimide structure. After adjusting the thickness of the polyimide layer and the size of the metal unit structure, ultra-low reflectivity is achieved with the minimum percentages of 0.0028 and 0.0025 at 0.471 and 1.560 THz, respectively(with <10% reflectivity for the bandwidths of 0.26 and 0.21 THz). The results provide a reference for the applications of multi-band terahertz metamaterial antireflection coatings.
引文
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[3] Li J,Pendry J B.Hiding under the carpet:a new strategy for cloaking[J].Physical Review Letters,2008,101(20):203901.
[4] Chen Y W,Han P Y,Zhang X C.Tunable broadband antireflection structures for silicon at terahertz frequency[J].Applied Physics Letters,2009,94(4):041106.
[5] Zhou Y X,Xu X L,Hu F R,et al.Graphene as broadband terahertz antireflection coating[J].Applied Physics Letters,2014,104(5):051106.
[6] Veselago V G.The electrodynamics of substances with simultaneously negative values of ε and μ[J].Soviet Physics Uspekhi,1968,10(4):509-514.
[7] Yu N F,Genevet P,Aieta F,et al.Flat optics:controlling wavefronts with optical antenna metasurfaces[J].IEEE Journal of Selected Topics in Quantum Electronics,2013,19(3):4700423.
[8] Kim J,Soref R,Buchwald W R.Multi-peak electromagnetically induced transparency (EIT)-like transmission from bull's-eye-shaped metamaterial[J].Optics Express,2010,18(17):17997-18002.
[9] Tao H,Bingham C M,Pilon D,et al.A dual band terahertz metamaterial absorber[J].Journal of Physics D:Applied Physics,2010,43(22):225102.
[10] Chen H T,Zhou J F,O′Hara J F,et al.A numerical investigation of metamaterial antireflection coatings[J].Terahertz Science and Technology,2010,3(2):66-73.
[11] Zhang B Y,Hendrickson J,Nader N,et al.Metasurface optical antireflection coating[J].Applied Physics Letters,2014,105(24):241113.
[12] Smith D R,Schultz S,Marko? P,et al.Determination of effective permittivity and permeability of metamaterials from reflection and transmission coefficients[J].Physical Review B,2002,65(19):195104.
[13] Liu P,Jiang J J,Chen Q,et al.Study on the electromagnetic properties of frequency selective surface absorber[J].Electronic Components & Materials,2011,30(10):56-59.刘鹏,江建军,陈谦,等.频率选择表面结构吸波体的电磁特性研究[J].电子元件与材料,2011,30(10):56-59.
[14] Baena J D,Bonache J,Martin F,et al.Equivalent-circuit models for split-ring resonators and complementary split-ring resonators coupled to planar transmission lines[J].IEEE Transactions on Microwave Theory and Techniques,2005,53(4):1451-1461.