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Dielectric resonator antennas (DRAs) represent a wellestabl ished concept for microwave frequencies. In recent years, DRAs and related counterparts have been embraced as structures for higher frequencies, including visible optics. This research trend is facilitated by advances in nanofabrication techniques and motivated by two prominent advantages of DRAs: 1) DRAs are highly efficient because their...
Most terahertz metasurfaces utilise metallic resonators for various functions ranging from filtering, polarisation conversion, modulation, perfect absorption, to beamforming. Here we show that silicon can replace metals to build resonators for similar functions with superior performance. In one case, moderately doped silicon is shown to support terahertz surface plasmon polaritons. Resonant cavities...
A broadband terahertz absorber based on plasmonic cross structure resonators is proposed and investigated. This plasmonic absorber yields above 90% absorbance from 0.67 THz to 1.78 THz in the simulation, compared with 0.74 THz to 1.62 THz in the experiment. The remarkable absorption bandwidth of about 90% in theory can be associated with two plasmonic resonances supported by the cavities bounded by...
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