A Dual-Band Tunable Metamaterial Near-Unity Absorber Composed of Periodic Cross and Disk Graphene Arrays
A three-dimensional dual-band perfect absorber in the THz range (3–10 THz) is theoretically investigated. The absorber is composed of periodically placed cross- and disk-shaped graphene arrays on the top of a gold layer separated by a thick SiO<inline-formula><tex-math...
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2018-01-01
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| author | Jianguo Zhang Jinping Tian Lu Li |
| author_facet | Jianguo Zhang Jinping Tian Lu Li |
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| description | A three-dimensional dual-band perfect absorber in the THz range (3–10 THz) is theoretically investigated. The absorber is composed of periodically placed cross- and disk-shaped graphene arrays on the top of a gold layer separated by a thick SiO<inline-formula><tex-math notation="LaTeX">$_{2}$</tex-math></inline-formula> dielectric spacer. The simulated results show two absorption peaks with near-unity absorbance (<inline-formula> <tex-math notation="LaTeX">$99.923\%$</tex-math></inline-formula> and <inline-formula><tex-math notation="LaTeX"> $99.601\%$</tex-math></inline-formula>) at wavelengths 43.747 <inline-formula><tex-math notation="LaTeX">$\mu$ </tex-math></inline-formula>m and 69.94 <inline-formula><tex-math notation="LaTeX">$\mu$</tex-math> </inline-formula>m, respectively. Also, the absorber is insensitive to the polarization of the incident light and has a good tolerance to the incident angle whether it is TE or TM waves. Moreover, the peak wavelengths of the absorber can be flexibly modulated by varying the Fermi level <inline-formula><tex-math notation="LaTeX">$\mu _{C}$</tex-math> </inline-formula> of graphene while no need to refabricate the structure. This paper provides a new perspective for the design of graphene-based tunable multiband perfect THz absorbers, but not limited to THz absorbers, and may also be used in other THz graphene-based photonic devices. |
| format | Article |
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| institution | Kabale University |
| issn | 1943-0655 |
| language | English |
| publishDate | 2018-01-01 |
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| spelling | doaj-art-fb3627f2357a4f0a95fe658a5fe1ea692025-08-20T03:32:53ZengIEEEIEEE Photonics Journal1943-06552018-01-0110211210.1109/JPHOT.2018.28156858315442A Dual-Band Tunable Metamaterial Near-Unity Absorber Composed of Periodic Cross and Disk Graphene ArraysJianguo Zhang0Jinping Tian1https://orcid.org/0000-0002-4257-7049Lu Li2https://orcid.org/0000-0003-2837-5819Institute of Theoretical Physics, State Key Laboratory of Quantum Optics and Quantum Optics Devices, Shanxi University, Taiyuan, ChinaCollege of Physics and Electronics Engineering, Shanxi University, Taiyuan, ChinaInstitute of Theoretical Physics, State Key Laboratory of Quantum Optics and Quantum Optics Devices, Shanxi University, Taiyuan, ChinaA three-dimensional dual-band perfect absorber in the THz range (3–10 THz) is theoretically investigated. The absorber is composed of periodically placed cross- and disk-shaped graphene arrays on the top of a gold layer separated by a thick SiO<inline-formula><tex-math notation="LaTeX">$_{2}$</tex-math></inline-formula> dielectric spacer. The simulated results show two absorption peaks with near-unity absorbance (<inline-formula> <tex-math notation="LaTeX">$99.923\%$</tex-math></inline-formula> and <inline-formula><tex-math notation="LaTeX"> $99.601\%$</tex-math></inline-formula>) at wavelengths 43.747 <inline-formula><tex-math notation="LaTeX">$\mu$ </tex-math></inline-formula>m and 69.94 <inline-formula><tex-math notation="LaTeX">$\mu$</tex-math> </inline-formula>m, respectively. Also, the absorber is insensitive to the polarization of the incident light and has a good tolerance to the incident angle whether it is TE or TM waves. Moreover, the peak wavelengths of the absorber can be flexibly modulated by varying the Fermi level <inline-formula><tex-math notation="LaTeX">$\mu _{C}$</tex-math> </inline-formula> of graphene while no need to refabricate the structure. This paper provides a new perspective for the design of graphene-based tunable multiband perfect THz absorbers, but not limited to THz absorbers, and may also be used in other THz graphene-based photonic devices.https://ieeexplore.ieee.org/document/8315442/Grapheneperfect absorberdual-bandtunable |
| spellingShingle | Jianguo Zhang Jinping Tian Lu Li A Dual-Band Tunable Metamaterial Near-Unity Absorber Composed of Periodic Cross and Disk Graphene Arrays IEEE Photonics Journal Graphene perfect absorber dual-band tunable |
| title | A Dual-Band Tunable Metamaterial Near-Unity Absorber Composed of Periodic Cross and Disk Graphene Arrays |
| title_full | A Dual-Band Tunable Metamaterial Near-Unity Absorber Composed of Periodic Cross and Disk Graphene Arrays |
| title_fullStr | A Dual-Band Tunable Metamaterial Near-Unity Absorber Composed of Periodic Cross and Disk Graphene Arrays |
| title_full_unstemmed | A Dual-Band Tunable Metamaterial Near-Unity Absorber Composed of Periodic Cross and Disk Graphene Arrays |
| title_short | A Dual-Band Tunable Metamaterial Near-Unity Absorber Composed of Periodic Cross and Disk Graphene Arrays |
| title_sort | dual band tunable metamaterial near unity absorber composed of periodic cross and disk graphene arrays |
| topic | Graphene perfect absorber dual-band tunable |
| url | https://ieeexplore.ieee.org/document/8315442/ |
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