Yan-Qun TONG, Shi-Yan WANG, Xiao-Xian SONG, Lei YANG, Jian-Quan YAO, Yun-Xia YE, Yun-Peng REN, Ya-Ting ZHANG, Shan-Shan XIN, Xu-Dong REN. Multi-band tunable terahertz absorber based on metamaterial [J]. Journal of Infrared and Millimeter Waves, 2020, 39(6): 735
- Journal of Infrared and Millimeter Waves
- Vol. 39, Issue 6, 735 (2020)
Fig. 1. Structure diagram of metamaterial absorber （a）Absorber structural unit, （b） cell structure side view, （c）equivalent circuit diagram of metamaterial resonator
Fig. 2. Reflection and absorption spectra of terahertz metamaterial absorbers without illumination
Fig. 3. The upper and lower surface current distribution of the absorber without illumination （a）0.821 THz, （b）3.929 THz
Fig. 4. Absorption spectra of metamaterials with different structural parameters （a） Absorption curves of different opening lengths, （b） absorption curves of different line widths, （c） absorption curves of different thickness of dielectric layers
Fig. 5. Characteristics of photosensitive silicon, （a） spectral characteristics，（b） illumination characteristics
Fig. 6. Terahertz metamaterial absorption spectra of silicon at different conductivities
Fig. 7. The upper and lower surface current distributions of the absorber with illumination （a）4.997 THz，σ =880 S/m；（b）1.846 THz，σ =1650 S/m；（c）3.091 THz，σ =1650 S/m；（d）5.676 THz，σ =5840 S/m；（e）1.197 THz，σ =1.055×105 S/m；（f）5.499 THz，σ =2.7×105 S/m；（g）3.546 THz，σ =3.65×105 S/m；（h）4.584 THz，σ =1.9×106 S/m
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