太赫兹辐射
超材料
谐振器
半金属
等离子体子
诺共振
偶极子
调制(音乐)
共振(粒子物理)
功勋
物理
调幅
Dirac(视频压缩格式)
材料科学
凝聚态物理
光电子学
石墨烯
频率调制
纳米技术
原子物理学
电信
无线电频率
量子力学
声学
计算机科学
中微子
硅
作者
Xiaoyong He,Feng Liu,Fangting Lin,Wangzhou Shi
标识
DOI:10.1088/1361-6463/abe898
摘要
Abstract The tunable propagation properties of 3D Dirac semimetal (DSM) patterned metamaterial (MM) structures have been symmetrically investigated in the terahertz (THz) regime. The results demonstrate that the resonant properties are very sensitive to the thicknesses of DSM MMs, and hundreds of nanometers are required to excite strong resonant curves. The DSM MMs support both strong LC and dipolar resonances, quite different from graphene MM patterns which mainly depend on dipolar resonance. As the Fermi level increases, the resonant strength becomes stronger, and significant modulation can be achieved, e.g. the amplitude and frequency modulation depths of transmission curves are more than 99% and 80%, respectively. In addition, by utilizing asymmetrical resonators, a very sharp Fano resonant peak is achieved with a large Q -factor of more than 25, for which the figure of merit is about 20. The results are very helpful to understand the tunable mechanisms of DSM devices and design novel THz plasmonic components, such as modulators, filters, and sensors.
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