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提出了一种能够实现负折射的准周期光子晶体(QPC)。该准晶光子晶体具有十二重对称性,由介质背景下空气孔的准周期阵列组成。用时域有限差分方法研究了电磁波通过该十二重准晶后的传播行为。对劈形准晶样品的研究表明,电磁波在该准晶结构中发生了负折射现象。进一步利用该准晶制成平行平板,研究了平板的表面截面对电磁波传播的影响。发现改变平板的表面截面,可以调节电磁场在板后的分布。在合适的界面条件下,准晶平板对电磁波实现了会聚。因此,在实际应用中应仔细选择适当的界面参数。
A quasi-periodic photonic crystal (QPC) that can achieve negative refraction is proposed. The quasicrystalline photonic crystal has twelve-fold symmetry consisting of a quasi-periodic array of air holes in a medium background. The time-domain finite difference method is used to study the propagation behavior of electromagnetic waves passing through the 12-fold recrystallization. Studies on the wedge-shaped quasicrystal samples show that the electromagnetic wave is negatively refracted in the quasicrystal structure. The quasi-crystal is further used to make a parallel flat plate, and the influence of the surface cross-section of the flat plate on the electromagnetic wave propagation is studied. It was found that by changing the surface cross-section of the plate, the distribution of the electromagnetic field behind the plate can be adjusted. Quasicrystal plates converge electromagnetic waves at the appropriate interface conditions. Therefore, the actual application should carefully select the appropriate interface parameters.