Ultrahigh-Q and Polarization-Independent Terahertz Metamaterial Perfect Absorber |
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Authors: | Wang Jing Hu Chengpeng Tian Qi Yu Wenxiu Tian Hao Li Li Liu Jianlong Zhou Zhongxiang |
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Affiliation: | 1.Department of Physics, Harbin Institute of Technology, Harbin, 150001, China ;2.Key Lab of In-fiber Integrated Optics of Ministry of Education, Harbin Engineering University, Harbin, 150009, China ; |
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Abstract: | Ensuring a good trade-off between high-quality factor (Q-factor) and polarization independency is a key challenge for designing practicable terahertz metamaterial devices. We propose a symmetric composite aluminum-structured metamaterial absorber to achieve high Q-factor beyond 80 and near-unity absorbance of arbitrary polarization waves in the terahertz regime. Ultrahigh Q-factor reaches 84, and polarization-independent absorption is as high as 99% for resonant frequency tuning from 7.58 to 8.97 THz, covering 14% of the standard THz gap. The geometric effect of the symmetric sublattice on resonant frequency tuning is analyzed. The large Q-factor and strong absorption by oblique incidence is discussed. Designed high-Q metamaterial perfect absorber has various applications, including terahertz hyperspectral imaging, filtering, and sensing. |
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