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首页> 外文期刊>Optics Communications: A Journal Devoted to the Rapid Publication of Short Contributions in the Field of Optics and Interaction of Light with Matter >Dual-band tunable terahertz perfect metamaterial absorber based on strontium titanate (STO) resonator structure
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Dual-band tunable terahertz perfect metamaterial absorber based on strontium titanate (STO) resonator structure

机译：基于钛酸锶（STO）谐振器结构的双频带调谐太赫兹完美的超材料吸收器

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摘要

A temperature-controlled dual-band terahertz perfect metamaterial absorber (MMA) based on strontium titanate (STO) resonator structure is proposed and investigated numerically. This MMA is a simple periodic array, consisting of two stacked square-shaped STO resonator structures and a copper substrate. Numerical simulation results indicate that the reflectance of the proposed MMA under room temperature T = 300 K is decreased to 2.1% and 0.2% at 0.114 THz and 0.181 THz, and corresponding absorbance is up to 97.9% and 99.8 %, respectively. Further results show that the designed MMA is polarization-insensitive, and wide-angle to the incident waves for both transverse electric (TE) and transverse magnetic (TM) modes. The simulated distributions of electromagnetic (EM) fields and power flow reveal that the observed high-level absorption is originated from the excitations of the fundamental dipole modes. Furthermore, the absorption property can be changed by varying structural parameters of the MMA and external temperature. Due to its excellent performance, the designed tunable MMA may find useful and important applications such as thermal emitter, bolometric imaging, energy harvesting, and sensing in terahertz region.
机译：提出了一种基于钛酸锶（STO）谐振器结构的温度控制的双频带Terahtz完美的超材料吸收（MMA），并在数值上进行研究。该MMA是一个简单的周期阵列，由两个堆叠的方形STO谐振器结构和铜基板组成。数值模拟结果表明，在室温下，所提出的MMA的反射率T = 300K降低至0.114六六六六，0.181六三分别下降至0.1％至0.2％，相应的吸光度分别为97.9％和99.8％。进一步的结果表明，设计的MMA是偏振不敏感的，并且与横向电气（TE）和横向磁性（TM）模式的入射波广角。电磁（EM）场和功率流的模拟分布表明观察到的高级吸收源自基本偶极模式的激动。此外，可以通过改变MMA和外部温度的结构参数来改变吸收性。由于其性能优异，设计的可调MMA可能会发现有用和重要的应用，如热发射器，散热测量，能量收集和在太赫兹地区的感测。

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