Considering the fact that just the electrons confined in the region of the skin depth will actually affect the plasma frequency due to the skin effect, a model for constructing epsilon-near-zero (ENZ) metamaterials through the arranged thin metallic wires with arbitrary cross-section is developed, utilizing the perimeter approximation. With our model, plasma frequency can be freely modulated just by the variance of the metallic wire perimeter, irrespective of the cross-section shape of wires. The finite element method (FEM) and S-parameters retrieval method were employed to numerically simulate the plasma frequencies, which have verified the validity of the theoretical model.
Chinese Acad Sci, State Key Lab Opt Technol Microfabricat, Inst Opt & Elect, Chengdu 610209, Peoples R China
Liu, Liyuan,Shi, Haofei,Luo, Xiangang,et al. A plasma frequency modulation model for constructing structure material with arbitrary cross-section thin metallic wires[J]. APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING,2009,95(2):563-566.