Abstract The absorption properties of one-dimensional quasi-periodic (Fibonacci and Thue Morse sequences) systems composed of Dirac semimetal are investigated. Numerical results show that nearly perfect broadband or narrowband absorption in mid-infrared range can be obtained using the same constituents with different sequences. For the Fibonacci sequence, a 90% absorption band with a relative bandwidth over 38% can be obtained, which results from the superimposing multiple resonances, and the average absorption over the absorption band can reach 97.2%. A nearly perfect narrowband absorption can be realized by the Thue Morse sequence due to the strong field localization effect. The absorption can be tunable by changing the Fermi energy of the Dirac semimetal, the geometry parameters and the permittivity of the constituents. In addition, the effects of the polarization and the incident angles of the incident wave on the absorption performance are also calculated. Our demonstrated structures have promising absorption properties and the results are valuable in designing tunable optoelectronic devices such as mid-infrared detectors and filters.

中文翻译：

---

含狄拉克半金属的一维准周期系统的带宽可转换中红外吸收

摘要 研究了由狄拉克半金属组成的一维准周期（Fibonacci 和Thue Morse 序列）系统的吸收特性。数值结果表明，使用不同序列的相同成分可以在中红外范围内获得近乎完美的宽带或窄带吸收。对于斐波那契数列，可以得到90%的吸收带，相对带宽超过38%，这是多次共振叠加的结果，吸收带上的平均吸收率可达97.2%。由于强场定位效应，Thue Morse 序列可以实现近乎完美的窄带吸收。可以通过改变狄拉克半金属的费米能量、几何参数和成分的介电常数来调节吸收。此外，还计算了入射波的偏振和入射角对吸收性能的影响。我们展示的结构具有良好的吸收特性，其结果对于设计可调谐光电器件（如中红外探测器和滤波器）很有价值。