Electromagnetic Penetration and Reflection Analysis in Fractal Structures Using Three-Dimensional Empirical Mode Decomposition
Electromagnetic Penetration and Reflection Analysis in Fractal Structures Using Three-Dimensional Empirical Mode Decomposition
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DOI：
10.1109/tmag.2022.3161997
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发表时间：
2022-09
影响因子：
2.1
通讯作者：
Ran Dong;Y. Fujita;Hiroaki Nakamura;S. Ikuno
中科院分区：
文献类型：
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作者：
Ran Dong;Y. Fujita;Hiroaki Nakamura;S. Ikuno
在这项研究中，在钨表面的绒毛结构的人工生成的中点位移算法（MDA）的基础上的随机分形。采用时域有限差分法（FDTD）模拟了电磁波在不同分形维数的绒毛结构中的传播。为了分析模糊结构周围的电磁穿透和反射，我们采用三维经验模式分解（TEMD）的时域有限差分法（FDTD）在空间频率域的分解模拟结果。计算结果表明，电场强度分布被分解为三维本征模函数（IMF），反映了电磁波从高空间频率到低空间频率撞击钨表面绒毛结构所引发的共振。这些分解的IMF揭示了模糊结构的光学特性，关于分形维数大小与钨表面的电磁穿透和反射之间的关系。
In this study, fuzz structures in tungsten surfaces are artificially generated using the midpoint displacement algorithm (MDA) based on the random fractal. The finite-difference time-domain (FDTD) method is employed to simulate electromagnetic wave propagation in the fuzz structures with different fractal dimension sizes. To analyze electromagnetic penetrations and reflections around the fuzz structures, we adopt the three-dimensional empirical mode decomposition (TEMD) to decompose simulation results by FDTD in the spatial frequency domain. The computation results showed that the distribution of electric field intensity is decomposed into 3-D intrinsic mode functions (IMFs), indicating resonances triggered by electromagnetic waves hitting the fuzz structures in the tungsten surface from high spatial frequency to low spatial frequency. These decomposed IMFs revealed the optical properties of fuzz structures regarding the relationship between fractal dimension sizes and the electromagnetic penetrations and reflections in the tungsten surface.