电介质层尺寸对超常材料折射率传感的影响

The Influences of Refractive Index Sensing of Metamaterials with Different Size of Dielectric Layer

提出了一种提高超常材料折射率传感灵敏度的方法。在超常材料完美吸收结构的基础上,通过改变电介质圆盘直径,探究折射率传感性能的变化。结果表明,随着电介质层圆盘直径的减小,折射率传感灵敏度和品质因子都有了近3倍的提高并趋于极限值。通过对电介质层电场分布的分析,进一步证实了适当减小电介质圆盘尺寸可有效的提高传感性能这一结论。这种新的设计方法同时具有高灵敏度、高品质因子的特点,对于超常材料的折射率传感应用研究提供了重要参考和依据。

A method was proposed to improve the sensitivity of the refractive index sensing of metamaterials. Based on the structures of metamaterials with perfect absorbing, the influences of refractive index sensing were studied with the different size of the dielectric layer. The results have showed that, with the decrease of the dielectric layer disc diameter, the refractive index sensing sensitivity and the figure of merit had a nearly 3-fold increase and tended to limit. By analyzing the electric field distribution in the dielectric layer, the conclusion that the sensing performance could be improved effectively by appropriately reduced the size of dielectric disc was further confirmed. This new design method with the characteristics of high sensitivity and high figure of merit simultaneously can provide an important reference and basis for the study of refractive index sensing application of metamaterials.