GO/PO Method for the Terahertz Scattering Computation of Objects With Multiple Small-Scale Grooves
GO/PO Method for the Terahertz Scattering Computation of Objects With Multiple Small-Scale Grooves
复制标题
多小尺度凹槽物体太赫兹散射计算的GO/PO方法
DOI：
10.1109/access.2019.2907704
复制
发表时间：
2019
期刊：
影响因子：
3.9
通讯作者：
Chunlei Dong
中科院分区：
文献类型：
--
作者：
Xiao Meng;Lixin Guo;Chunlei Dong
本文改进了几何光学(GO)/物理光学（PO）方法，分析了具有相同尺寸的多个小尺度沟槽的物体的太赫兹（THz）波散射特性。对于传统的GO/PO方法，当沟槽数达到数十甚至数百个时，大量冗余相交测试的存在将成为太赫兹波段电磁散射计算的主要限制。因此，为了解决这一问题，采用GO/PO法计算其中一个凹槽的散射场，并根据其他凹槽的尺寸信息进行扩展，得到其他凹槽的散射场。这样可以有效地减少计算量。为了验证该方法的有效性，将结果与MLFMM、传统GO/PO方法和实验数据进行了比较。达成了很好的协议。同时，与传统的GO/PO方法相比，该方法的运行时间大大节省。此外，还研究了具有多小尺度沟槽的物体在太赫兹波段的散射特性。仿真结果表明，小尺寸沟槽对太赫兹波段的电磁散射特性有很大影响。
In this paper, the Geometric Optics (GO)/Physical Optics (PO) method is improved to analyze the terahertz (THz)-wave scattering characteristics of objects with multiple small-scale grooves, where the grooves are of the same size. For the traditional GO/PO method, when the number of grooves reaches dozens or even hundreds, the existence of a large number of redundant intersection tests will be a main limitation to calculate the electromagnetic (EM) scattering in THz band. Therefore, in order to solve this problem, the scattered field from one of the grooves is computed using the GO/PO method and extended to obtain the scattered field of the other grooves according to their dimensional information. In this way, the computation load is effectively reduced. To demonstrate the validity of our method, the results are compared with those of MLFMM, traditional GO/PO method and experimental data. A good agreement is achieved. Meanwhile, the runtime of our method is compared with that of traditional GO/PO method, where the computational time is greatly saved. Furthermore, the scattering characteristics of objects with multiple small-scale grooves in THz band is studied. The simulation results show that the small-scale grooves will have a great effect on EM scattering characteristics in THz band.
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