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Effect of polarization and morphology on the optical properties of absorbing nanoporous thin films

机译:偏振和形态对吸收纳米多孔薄膜光学性能的影响

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摘要

This paper investigates the possibility of tuning the optical properties of thin films by introducing nanopores with different shape, size, and spatial distribution. The complex index of refraction of nanoporous thin films with various morphologies is determined for normally incident transverse magnetic (TM) and transverse electric (TE) absorbing electromagnetic waves by numerically solving the two-dimensional Maxwell's equations. The numerical results are compared with predictions from widely used effective medium approximations. For thin films with isotropic morphology exposed to TM waves, good agreement is found with the parallel model. For thin films with anisotropic morphology, the numerical results for TE waves are independent of the morphology and agree well with the Volume Averaging Theory model. By contrast, for incident TM waves, the retrieved effective optical properties depend on both porosity and film morphology. These results can be used to design nanocomposite materials with tunable optical properties and to determine their porosity and pore's spatial arrangement.
机译:本文研究了通过引入具有不同形状,大小和空间分布的纳米孔来调节薄膜光学特性的可能性。通过数值求解二维麦克斯韦方程,可以确定吸收电磁波的法向入射横向电磁(TM)和横向电磁(TE)的各种形态的纳米多孔薄膜的复折射率。将数值结果与广泛使用的有效介质近似值的预测结果进行比较。对于暴露于TM波的各向同性形态的薄膜,与平行模型发现很好的一致性。对于具有各向异性形态的薄膜,TE波的数值结果与形态无关,并且与体积平均理论模型非常吻合。相比之下,对于入射TM波,检索到的有效光学特性取决于孔隙率和薄膜形态。这些结果可用于设计具有可调光学特性的纳米复合材料,并确定其孔隙率和孔的空间排列。

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