Optimization Design On Metamaterial Element Loss And THz Absorber

In recent years, metamaterials as a kind of structure with unique properties have been receiving more and more attentions. The constitutive parameters of Split Resonator Ring (SRR), which is a basic unit structure of metamaterials, directly depend on its physical dimensions. Since the sizes of metamaterials structures are usually small, its performance can be improved by fine-tuning of the structure sizes.The electromagnetic simulation software is employed to calculate the amplitude and phase of scatter parameters of SRR, and the electromagnetic parameter retrieval method is used to obtain the permittivity (ε), permeability (μ), index (n) and impedance (z). We apply a hybrid optimization algorithm to reduce the return loss (S11) of the SRR with a wire. The hybrid algorithm combines the differential evolution strategy and the continuous ant colony optimization. Numerical simulations show that the optimized return loss of this structure is less than-16dB for the frequencies ranging from10.4GHz to11.6GHz.The tangent loss of the SRR is above1from8.6GHz-9.8GHz. We apply the hybrid optimization algorithm to optimize the tangent loss. The simulation results show that the optimized tangent loss of this structure is almost0for the frequencies ranging from8.6GHz-9.8GHz.We also apply the hybrid algorithm to optimize the bandwidth of a terahertz broadband metamaterial absorber. Numerical results show that the optimized absorber has the bandwidth of0.103THz with the absorptance large than90%...