Investigation of Nonreciprocal Dispersion Phenomena in Anisotropic Periodic Structures Based on a Curvilinear FDFD Method
Investigation of Nonreciprocal Dispersion Phenomena in Anisotropic Periodic Structures Based on a Curvilinear FDFD Method
复制标题
基于曲线FDFD方法研究各向异性周期性结构中的非互易色散现象
DOI：
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发表时间：
2017
影响因子：
4.3
通讯作者：
G. Kyriacou
中科院分区：
文献类型：
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作者：
P. Theofanopoulos;C. Lavranos;K. Zoiros;G. Trichopoulos;G. Granet;G. Kyriacou
本文的目的是研究各向异性加载的二维周期结构中的非互易现象。为此，我们建立了2-D曲线频域有限差分法与周期性边界条件相结合，并扩展到加载各向同性和一般各向异性材料的周期性结构的特征分析。周期性结构在2-D域中模拟，而均匀性被认为是沿沿着第三轴。沿第三轴的传播常数沿着可以是零（平面内传播）或非零（平面外传播）。特别努力致力于识别适当的不可约布里渊区进行扫描的特征分析。在此认识到，类似于几何人工晶体各向异性，波传播方向不对称性也修改微波区域中的不可约布里渊区。通过对包括条形光栅在内的不同周期性结构的本征分析，研究了旋向性和特别磁化的铁氧体以及全张量各向异性（任意偏置铁氧体）材料载荷。有趣的非互易后向波和单向现象是合理的预期。
The aim of this paper is the investigation of nonreciprocal phenomena in anisotropically loaded 2-D periodic structures. For this purpose, our well-established 2-D curvilinear finite difference frequency domain method is combined with periodic boundary conditions and extended toward the eigenanalysis of periodic structures loaded with both isotropic and general anisotropic materials. The periodic structures are simulated in a 2-D domain, while uniformity is considered along the third axis. The propagation constant along the third axis can either be zero (in-plane-propagation) or nonzero (out-of-plane propagation). Particular effort was devoted to the identification of the appropriate irreducible Brillouin zone to be scanned during the eigenanalysis. It was herein realized that similar to geometrically artificial crystal anisotropy, the wave propagation directional asymmetries modify the irreducible Brillouin zone in the microwave regime as well. Both gyrotropic and particularly magnetized ferrite as well as full tensor anisotropic (arbitrarily biased ferrite) material loadings are investigated through the eigenanalysis of different periodic structures, including strip grating. Interesting nonreciprocal backward wave and unidirectional phenomena are justified as expected.