一种结构简单的太赫兹频段宽带完美吸收体
A Simple Construction of Terahertz Broadband Metamaterial Perfect Absorber
DOI: 10.12677/APP.2020.105038, PDF,    国家自然科学基金支持
作者: 赵 赫, 许小亮*, 陈 晨, 汪淑慧, 陈 奎：中国科学技术大学物理系，纳米功能材料实验室，安徽 合肥
关键词: 超常材料；宽带；完美吸收体；时域有限差分；Metamaterials； Broadband； Perfect Absorber； Finite Difference Time Domain
摘要: 采用有限时域差分法研究了一种模型结构简单且可以在太赫兹频段工作的宽带超材料完美吸收体。模拟结果表明，这种超材料吸收体可以在1.13 THz~2.25 THz频率范围内实现90%以上的宽带吸收，其中在1.25 THz~1.75 THz实现99%以上的完美吸收。利用时域有限差分(finite-different time domain, FDTD)法对该设计进行模拟计算，通过改变器件的尺寸、入射电磁波的极化角度和入射角等参数，分析其内部吸收机理。通过模型几何参数和结构内部的电磁场分布分析，对比高电导率的金属，低电导率金属铬双环内外环的协同作用使得入射电磁能量主要通过欧姆损耗耗散在金属层。该仿真结果为低电导率金属等离子体超材料的完美吸收研究和应用提供了参考和依据。
Abstract: A broadband perfect absorber which can work in terahertz band is studied via the finite difference time domain method. It’s discovered that the proposed metamaterial absorber could achieve per-fect absorption of over 99% in 1.25 THz - 1.75 THz and over 90% in 1.13 THz - 2.25 THz. The fi-nite-different time domain (FDTD) method was used to simulate the designed structure. And the internal absorption mechanism was analyzed by changing the size of the device, the polarization angle and incident angle of the incident electromagnetic wave. Through the analysis of geometric parameters of the structure model and the distribution of electromagnetic field inside it, we found that the coupling effect of the inner and outer rings of chromium with low conductivity causes that the incident electromagnetic energy dissipates in the metal layer because of the ohm loss. The simulation results provide an important reference for the study and application of the metamaterials perfect absorptions of metal plasma with low conductivity.
文章引用：赵赫, 许小亮, 陈晨, 汪淑慧, 陈奎. 一种结构简单的太赫兹频段宽带完美吸收体[J]. 应用物理, 2020, 10(5): 289-296. https://doi.org/10.12677/APP.2020.105038

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