All-Silicon Polarization-Insensitive Metamaterial Absorber in the Terahertz Range
Zongcheng Xu,
Yujie Li,
Bin Han,
Yue Wang,
Quan Yuan,
Yanan Li,
Weiyan He,
Junhua Hao,
Liang Wu,
Jianquan Yao
Affiliations
Zongcheng Xu
Department of Physics, Tianjin Renai College, Tianjin 301636, China
Yujie Li
Department of Physics, Tianjin Renai College, Tianjin 301636, China
Bin Han
Department of Physics, Tianjin Renai College, Tianjin 301636, China
Yue Wang
Department of Physics, Tianjin Renai College, Tianjin 301636, China
Quan Yuan
Department of Physics, Tianjin Renai College, Tianjin 301636, China
Yanan Li
Department of Physics, Tianjin Renai College, Tianjin 301636, China
Weiyan He
Department of Physics, Tianjin Renai College, Tianjin 301636, China
Junhua Hao
Department of Physics, Tianjin Renai College, Tianjin 301636, China
Liang Wu
Key Laboratory of Opto-Electronics Information Science and Technology, Ministry of Education, Institute of Laser and Opto-Electronics, Tianjin University, Tianjin 300072, China
Jianquan Yao
Key Laboratory of Opto-Electronics Information Science and Technology, Ministry of Education, Institute of Laser and Opto-Electronics, Tianjin University, Tianjin 300072, China
All-silicon terahertz absorbers have attracted considerable interest. We present a design and numerical study of an all-silicon polarization-insensitive terahertz metamaterial absorber. The meta-atoms of the metamaterial absorber are square silicon rings which can be viewed as gratings. By properly optimizing the structure of the meta-atom, we achieve a broadband absorptivity that is above 90% ranging from 0.77 THz to 2.53 THz, with a relative bandwidth of 106.7%. Impedance matching reduces the reflection of the terahertz waves and the (0, ±1)-order diffraction induce the strong absorption. The absorption of this absorber is insensitive to the polarization of the terahertz wave and has a large incident angle tolerance of up to 60 degrees. The all-silicon metamaterial absorber proposed here provides an effective way to obtain broadband absorption in the terahertz regime. Metamaterial absorbers have outstanding applications in terahertz communication and imaging.
