基于交叉凹陷贴片谐振器的用于太赫兹波的超薄六波段偏振不敏感完美超材料吸收器
Ultrathin Six-Band Polarization-Insensitive Perfect Metamaterial Absorber Based on a Cross-Cave Patch Resonator for Terahertz Waves.
作者信息
Cheng Yong Zhi, Huang Mu Lin, Chen Hao Ran, Guo Zhen Zhong, Mao Xue Song, Gong Rong Zhou
机构信息
School of Information Science and Engineering, Wuhan University of Science and Technology, Wuhan 430081, China.
Hubei Province Key Laboratory of Occupational Hazard Identification and Control, Wuhan University of Science and Technology, Wuhan 430081, China.
出版信息
Materials (Basel). 2017 May 28;10(6):591. doi: 10.3390/ma10060591.
A simple design of an ultrathin six-band polarization-insensitive terahertz perfect metamaterial absorber (PMMA), composed of a metal cross-cave patch resonator (CCPR) placed over a ground plane, was proposed and investigated numerically. The numerical simulation results demonstrate that the average absorption peaks are up to 95% at six resonance frequencies. Owing to the ultra-narrow band resonance absorption of the structure, the designed PMMA also exhibits a higher Q factor (>65). In addition, the absorption properties can be kept stable for both normal incident transverse magnetic (TM) and transverse electric (TE) waves. The physical mechanism behind the observed high-level absorption is illustrated by the electric and power loss density distributions. The perfect absorption originates mainly from the higher-order multipolar plasmon resonance of the structure, which differs sharply from most previous studies of PMMAs. Furthermore, the resonance absorption properties of the PMMA can be modified and adjusted easily by varying the geometric parameters of the unit cell.
提出并数值研究了一种简单的超薄六波段偏振不敏感太赫兹完美超材料吸收器（PMMA）设计，该吸收器由置于接地平面上的金属交叉凹槽贴片谐振器（CCPR）组成。数值模拟结果表明，在六个共振频率处平均吸收峰高达95%。由于该结构具有超窄带共振吸收特性，所设计的PMMA还具有较高的品质因数（>65）。此外，对于垂直入射的横向磁波（TM）和横向电波（TE），吸收特性均可保持稳定。通过电场和功率损耗密度分布说明了所观察到的高水平吸收背后的物理机制。完美吸收主要源于该结构的高阶多极等离子体共振，这与之前大多数关于完美超材料吸收器的研究有很大不同。此外，通过改变单元胞的几何参数，可以轻松修改和调整PMMA的共振吸收特性。
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