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- W2889724964 abstract "We propose a broadband tunable metamaterial absorber with near-unity absorption in the terahertz regime based on a target-patterned graphene sheet. Due to gradient diameter modulation of the graphene sheet and circular symmetry of the unit cell, broadband and polarization-independent properties are achieved in the absorber. A full-wave numerical simulation is performed, and the results show that the absorber's bandwidth of 90% terahertz absorption reaches 1.57 THz with a central frequency of 1.83 THz under normal incidence. At oblique incidence, the broadband absorption of the absorber remains more than 75% over a wide incidence angles up to 60°for the transverse electric (TE) mode and 75°for the transverse magnetic (TM) mode. Furthermore, tunable property is implemented and the peak absorption of the absorber can be tuned from 19% to near 100% by changing the Fermi energy of the graphene sheet from 0 to 0.9 eV via electrostatic doping. The absorber is scalable to the infrared and visible frequencies, which could be used as tunable sensors, filters and photovoltaic devices." @default.
- W2889724964 created "2018-09-27" @default.
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- W2889724964 date "2018-09-17" @default.
- W2889724964 modified "2023-10-05" @default.
- W2889724964 title "Polarization-independent and angle-insensitive broadband absorber with a target-patterned graphene layer in the terahertz regime" @default.
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- W2889724964 doi "https://doi.org/10.1364/oe.26.025558" @default.
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