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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| Main Authors: | , , |
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| Format: | Article |
| Language: | English |
| Published: |
IEEE
2018-01-01
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| Series: | IEEE Photonics Journal |
| Subjects: | |
| Online Access: | https://ieeexplore.ieee.org/document/8315442/ |
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| Summary: | 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. |
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| ISSN: | 1943-0655 |