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A Drude-Two-CP-FDTD method for Drude-critical points model of metal nanofilms

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Abstract

Based on Drude-critical points (Drude-Two-CP) model for a dispersive media, a finite-difference time-domain (FDTD) method for metal nanofilms is proposed. By establishing the corresponding relationship between Drude-Two-CP model and Drude–Lorentz model, the conversion coefficients between the two models are calculated. And we modify the Drude-Two-CP model into the form of standard Lorentz model. The transformation relationship between the two models is conducive to the modular programming of FDTD. Formula deduction and calculation results show that Drude-Two-CP model has higher fitting accuracy and fitting formulas are more complex. Using the proposed FDTD method, we have calculated the reflection, transmission and extinction coefficients of gold and aluminium nanofilms. The results show that the FDTD results are in good agreement with those of Drude-Two-CP model, which are better than those of Drude–Lorentz model. Therefore, the Drude-Two-CP-FDTD method proposed in this paper is helpful for improving the accurate modelling and calculation of nano-optical structures.

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Acknowledgements

This work is supported by the Natural Science Foundation of Hebei Province Youth Fund (Grant No. F2019111025) and the China Agricultural Science and Education Fund (Grant No. NKJ201802040).

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Authors and Affiliations

  1. College of Electronics and Information Engineering, Hengshui University, Hengshui, 053000, People’s Republic of China

    Jian-**ao Liu & Ling-Hui Ming

  2. School of Physics Science and Technology, Nan**g Normal University, Nan**g, 210023, People’s Republic of China

    Jian-**ao Liu, Yan Jiang & Wan-Chun Tang

  3. Department of Physics, College of Science, Nan**g Agricultural University, Nan**g, 210095, People’s Republic of China

    Jian-**ao Liu & Hong-Wei Yang

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  1. Jian-**ao Liu
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  2. Yan Jiang
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Correspondence to Hong-Wei Yang.

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Hong-Wei Yang and Wan-Chun Tang contributed equally to this work.

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Liu, JX., Jiang, Y., Ming, LH. et al. A Drude-Two-CP-FDTD method for Drude-critical points model of metal nanofilms. Eur. Phys. J. Plus 135, 805 (2020). https://doi.org/10.1140/epjp/s13360-020-00824-8

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