In this paper, we demonstrate the design of a polarization-independent wideband absorber of light that consists of a perforated graphene sheet on top of a lossless dielectric spacer placed on a metallic reflector. The single layer absorber is duly designed based on impedance matching concept. The simulated results indicate that the structure produces 0.98 THz broad absorption from 1.80 THz to 2.72 THz with absorptivity larger than 90% at the normal incidence. The electromagnetic (EM) field distributions and the plots of surface power loss density have been illustrated to explain the absorption mechanism of the structure. The variation of chemical potential from 0.8 to 1.2 eV keeps 90% absorption bandwidth as much as 1 THz band. The polarization-insensitive feature and the properties under oblique incidence are also investigated. Finally, the interference theory is used to analyze and interpret the broadband absorption mechanism.
2. Han, Y., W. Che, and Y. Chang, "Investigation of thin and broadband capacitive surface-based absorber by the impedance analysis method," IEEE Trans. Electromag. Comp., Vol. 57, No. 1, 22-26, Feb. 2015.
doi:10.1109/TEMC.2014.2358686
3. Han, Y. and W. Che, "Low-profile broadband absorbers based on capacitive surfaces," Antenna Wireless Propag. Lett., 2016.
4. Li, M., S. Q. Xiao, Y.-Y. Bai, and B.-Z. Wang, "An ultrathin and broadband radar absorber using resistive FSS," Antenna Wireless Propag. Lett., Vol. 11, 748-751, 2012.
5. Landy, N. I., S. Sajuyigbe, J. J. Mock, D. R. Smith, and W. J. Padilla, "Perfect metamaterial absorber," Physical Review Lett., Vol. 100, No. 20, 207402(1-4), 2008.
doi:10.1103/PhysRevLett.100.207402
6. Liu, Y., S. Gu, C. Luo, and X. Zhao, "Ultra-thin broadband metamaterial absorber," Applied Physics A, Vol. 108, No. 1, 19-24, 2012.
doi:10.1007/s00339-012-6936-0
7. Sun, J., L. Liu, G. Dong, and J. Zhou, "An extremely broad band metamaterial absorber based on destructive interference," Optics Express, Vol. 19, No. 22, 21155-21162, 2011.
doi:10.1364/OE.19.021155
8. Chen, J., Z. Hu, G. Wang, X. Huang, S. Wang, X. Hu, and M. Liu, "High-impedance surface-based broadband absorbers with interference theory," IEEE Trans. Antennas Propag., Vol. 63, No. 10, 4367-4374, 2015.
doi:10.1109/TAP.2015.2459138
9. Ferguson, B. and X. C. Zhang, "Materials for terahertz science and technology," Nature Materials, Vol. 1, No. 1, 26-33, 2002.
doi:10.1038/nmat708
10. Geim, A. K., "Graphene: status and prospects," Science, Vol. 324, No. 5934, 1530-1534, 2009.
doi:10.1126/science.1158877
11. Bao, Q. and K. P. Loh, "Graphene photonics, plasmonics, and broadband optoelectronic devices," ACS Nano, Vol. 6, No. 5, 3677-3694, 2012.
doi:10.1021/nn300989g
12. Fardoost, A., F. G. Vanani, and R. Safian, "Design of a multilayer graphene-based ultrawideband terahertz absorber," IEEE Trans. Nanotech., Vol. 16, No. 1, 68-74, 2017.
13. Xu, B. Z., C. Q. Gu, Z. Li, and Z. Y. Niu, "A novel structure for tunable terahertz absorber based on graphene," Optics Express, Vol. 21, No. 20, 23803-23811, 2013.
doi:10.1364/OE.21.023803
14. Pu, M., P. Chen, Y. Wang, Z. Zhao, C. Wang, C. Huang, C. Hu, and X. Luo, "Strong enhancement of light absorption and highly directive thermal emission in graphene," Optics Express, Vol. 21, No. 10, 11618-11627, 2013.
doi:10.1364/OE.21.011618
15. Yudistira, H. T., "Tailoring multiple reflections by using graphene as background for tunable terahertz metamaterial absorber," Materials Research Express, Vol. 6, No. 7, 075804(1-11), 2019.
doi:10.1088/2053-1591/ab15bd
16. Amin, M., M. Farhat, and H. Bac, "An ultra-broadband multilayered graphene absorber," Optics Express, Vol. 21, No. 24, 29938-29948, 2013.
doi:10.1364/OE.21.029938
17. Yudistira, H. T., L. Y. Ginting, and K. Kananda, "High absorbance performance of symmetrical split ring resonator (SRR) terahertz metamaterial based on paper as spacer," Materials Research Express, Vol. 6, No. 2, 025804(1-9), 2018.
doi:10.1088/2053-1591/aaf27e
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