点缺陷无序超晶格光子晶体中的导共振
Guided resonances in photonic crystals with point-defected aperiodically-ordered supercells
摘要：
本文研究了基于点缺陷无序超原胞的光子晶体平板中的导共振激发。具体参考穿孔板结构和Ammann-Beenker八边形晶格几何形状，我们进行了平面波响应和底层模态结构的全波数值研究，这说明了引入保序和破序缺陷引起的代表性效应。我们的研究结果表明，通过明智地引入点缺陷，打破超原胞镜对称性，使激发，否则不耦合GR，控制其场分布的对称性，从而构成一个有吸引力的替代方案，这些GR工程方法的基础上的孔形状的不对称。在这个框架中，考虑到它们可以提供的各种不等价的缺陷位点，非对称有序的超晶胞似乎天生就适合。
英文摘要：
In this paper, we study the excitation of guided resonances (GRs) in photonic-crystal slabs based on point-defected aperiodically-ordered supercells. With specific reference to perforated-slab structures and the Ammann-Beenker octagonal lattice geometry, we carry out full-wave numerical studies of the plane-wave responses and of the underlying modal structures, which illustrate the representative effects induced by the introduction of symmetry-preserving and symmetry-breaking defects. Our results demonstrate that breaking the supercell mirror symmetries via the judicious introduction of point-defects enables for the excitation of otherwise uncoupled GRs, with control on the symmetry properties of their field distributions, thereby constituting an attractive alternative to those GR-engineering approaches based on the asymmetrization of the hole shape. In this framework, aperiodically-ordered supercells seem to be inherently suited, in view of the variety of inequivalent defect sites that they can offer.
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