| CROSS-DISCIPLINARY PHYSICS AND RELATED AREAS OF SCIENCE AND TECHNOLOGY |
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Graphene-Based Tunable Polarization Insensitive Dual-Band Metamaterial Absorber at Mid-Infrared Frequencies |
| ZHANG Yu-Ping, LI Tong-Tong, LV Huan-Huan, HUANG Xiao-Yan, ZHANG Xiao, XU Shi-Lin, ZHANG Hui-Yun** |
Qingdao Key Laboratory of Terahertz Technology, College of Electronic Communication and Physics, Shandong University of Science and Technology, Qingdao 266510
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| Cite this article: |
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ZHANG Yu-Ping, LI Tong-Tong, LV Huan-Huan et al 2015 Chin. Phys. Lett. 32 068101 |
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Abstract A graphene-based tunable dual-band metamaterial absorber which is polarization insensitive is numerically proposed at mid-infrared frequencies. In numerical simulation the metamaterial absorber exhibits two absorption peaks at the resonance wavelengths of 6.246 μm and 6.837 μm when the Fermi level of graphene is fixed at 0.6 eV. Absorption spectra at different Fermi levels of graphene are displayed and tuning functions are discussed in detail. Both the resonance wavelengths of the absorber blue shift with the increase in Fermi level of graphene. Moreover, the surface current distributions on the gold resonator and ground plane at the two resonance wavelengths are simulated to deeply understand the physical mechanism of resonance absorption.
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Received: 28 January 2015
Published: 30 June 2015
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| PACS: |
81.05.ue
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(Graphene)
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78.67.Pt
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(Multilayers; superlattices; photonic structures; metamaterials)
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75.40.Mg
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(Numerical simulation studies)
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