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Thermally tunable terahertz metasurface absorber based on all dielectric indium antimonide resonator structure
Optical Materials ( IF 3.9 ) Pub Date : 2020-04-01 , DOI: 10.1016/j.optmat.2020.109801
Hao Luo , Yongzhi Cheng

Abstract In this paper, we present a novel design of temperature tunable metasurface absorber (MSA) based on all dielectric indium antimonide (InSb) resonator structure in terahertz (THz) region. The permittivity of the InSb dielectric is dependent on the variation of temperature. Based on the perfect impedance-match (Re(z)≈1) to the free space, the absorbance of the proposed MSA is up to 99.9% at 1.43 THz and the Q-factor is about 26.9 when temperature is 285 K. The perfect absorption of the MSA is mainly from excitation of fundamental dipolar mode. In addition, the MSA is polarization-insensitive for both transverse electric (TE) and transverse magnetic (TM) waves. Furthermore, the absorption properties of the MSA can be adjusted by changing the geometric parameters of the unit-cell structure and temperature. The design offers a new route for control of THz absorption with potential applications in imaging, energy harvesting, sensing, and detecting.

中文翻译:

基于全介电铟锑谐振器结构的热可调太赫兹超表面吸收器

摘要 在本文中,我们提出了一种基于太赫兹 (THz) 区域的全介电锑化铟 (InSb) 谐振器结构的温度可调超表面吸收器 (MSA) 的新颖设计。InSb 电介质的介电常数取决于温度的变化。基于与自由空间的完美阻抗匹配 (Re(z)≈1),所提出的 MSA 在 1.43 THz 处的吸光度高达 99.9%,当温度为 285 K 时,Q 因子约为 26.9。 MSA 的吸收主要来自基本偶极模式的激发。此外,MSA 对横向电 (TE) 波和横向磁 (TM) 波均不敏感。此外,可以通过改变晶胞结构和温度的几何参数来调整 MSA 的吸收特性。
更新日期:2020-04-01
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