摘要:
提出一种以四边缺口的三层纳米方片为基本离散单元的左手材料,对单元的S参数进行仿真计算,并对反演得到的复折射率n、复介电常数ε、复磁导率μ等特性参数进行分析.结果表明,这种结构的负折射率频域分布在可见光的蓝光至近紫外区域,负折射率峰值位于可见光紫端边缘748 THz处,且此时材料的品质因数(FOM)为15.4,材料损耗极小,透过率极高,有利于实际应用.
Abstract:
A left-handed material composed of unit cells of three-layered square nanoflake with four edges gapped is proposed in this paper. The S-parameters of the unit cell are caeulated in the numeric simulation, and the property parameters such as the retrieved complex refractive index n, permittivity ε and permeability μ, etc. are analyzed. It is shown that, the frequency band in which the refractive index of this structure being negative lies from blue in the visible region to near uhraviolet, and the peak of negative refractive index lies at 748 THz, namely the violet end of the visible region. And the figure of merit of the material is 15.4, so it may have practical applications because of its low loss and high transmission.
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