| 摘要: |
| 基于三维狄拉克半金属（3D DSM）的载流子迁移率高、可调谐性好的优点,开展了太赫兹波可调谐双频吸收器（THz MMA）的研制工作.研究表明,通过破坏微结构的对称性,THz MMA可以在太赫兹波段实现近似完美吸收,并且随着非对称度的增加,吸收峰从1.322 THz蓝移至1.721 THz,调制深度为23.2%,共振峰Q因子接近20.此外,通过改变费米能级,3D DSM吸收器的共振谱线可以在很大范围内调节,如费米能级在0.05~0.15 eV内变化时,低频（高频）吸收峰在0.826~0.993 THz （1.098~1.371 THz）内调节,相应的调制深度为17%（20%）.该研究结果对于设计高性能的太赫兹波器,如探测器、滤波器、传感器件等很有帮助. |
| 关键词: 三维狄拉克半金属（3D DSM） 太赫兹 超材料 吸收器 可调谐性 |
| DOI：10.3969/J.ISSN.1000-5137.2023.05.007 |
| 分类号:O 469 |
| 基金项目:上海市地方院校能力建设专项（22010503300）；上海市自然科学基金面上项目（21ZR1446500）；上海师范大学校级项目（SK202240） |
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| A terahertz dual-frequencies metamaterial absorber based on 3D Dirac semimetal |
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LIU Shilin1, CHENG Yan1, JIANG Shizeng1, LI Jiaxin1, HE Xiaoyong1,2
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1.Mathematics and Science College, Shanghai Normal University, Shanghai 200234, China;2.Key Lab Submillimeter Astrophysics, Shanghai Normal University, Shanghai 200234, China
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| Abstract: |
| By utilizing the advantages of high carrier mobility and good tunable properties of 3D Dirac semimetal （3D DSM）, we propose a terahertz （THz） dual-frequencies metamaterial absorbers （MMA）. The results manifest that by breaking the symmetry of the double-stripes microstructure, nearly unity absorption peaks can be observed in the THz waveband. As the asymmetric degree increases, the absorption peak indicates a blue shift from 1.322 THz to 1.721 THz, and the according modulation depth is 23.2%, and the value of the Q-factor is close to 20. Additionally, by change the Fermi level of the 3D DSM, the resonance curve of the THz MMA can be regulated in a wide range. For example, if the Fermi level changes in the range of 0.05-0.15 eV, the low-frequency （high-frequency） absorption peak is modulated in the range of 0.826-0.993 THz （1.098-1.371 THz）, and the corresponding modulation depth is 17%（20%）. These results are helpful for design of high-performance devices, such as detectors, filters, sensors, and so on. |
| Key words: 3D Dirac semimetal （3D DSM） terahertz metamaterial absorber tunable |
