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Spatial correlations and optical properties in three-dimensional deterministic aperiodic structures

机译:三维确定性非周期性结构中的空间相关性和光学性质

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摘要

Photonic systems have strongly varying optical properties depending on the spatial correlations present in a given realization. In photonic crystals the correlations are spatially periodic forming Bravais lattices whereas the building blocks of an amorphous medium are randomly distributed without any long-range order. In this manuscript we study the optical properties of so-called deterministic aperiodic structures which fill the gap between the aforementioned two limiting cases. Within this group we vary the spectrum of the spatial correlations from being pure-point over singularly-continuous to absolutely-continuous. The desired correlations are created in direct-laser written three-dimensional polymer structures using one construction principle which allows us to attribute the optical behaviour solely to the encoded spectrum. Infrared reflection measurements reveal the characteristic response of each spectral type verifying the successful fabrication of large deterministic aperiodic structures. To prove the presence of the correlations in all directions we perform transmission experiments parallel to the substrate by means of micro-optical mirrors placed next to the structures. Transport measurements reveal a strong dependence of the effective beam width at the output facet on the encoded lattice type. Finally, we reproduce the lattice type dependent transport behavior in numerical calculations ruling out extrinsic experimental reasons for these findings.
机译:根据给定实现中存在的空间相关性,光子系统的光学特性会发生很大变化。在光子晶体中,相关性是空间周期性形成的Bravais晶格,而无定形介质的构成基块是随机分布的,没有任何长程顺序。在这份手稿中,我们研究了所谓的确定性非周期性结构的光学性质,这些结构填补了上述两种极限情况之间的空白。在这一组中,我们改变了空间相关性的范围,从纯点到奇异连续到绝对连续。使用一种构造原理在直接激光写入的三维聚合物结构中创建所需的相关关系,这使我们可以将光学行为仅归因于编码光谱。红外反射测量结果揭示了每种光谱类型的特征响应,从而验证了大型确定性非周期性结构的成功制造。为了证明在所有方向上都存在相关性,我们通过与结构相邻放置的微光学镜平行于基板执行透射实验。传输测量结果显示出输出面上的有效光束宽度对编码晶格类型的强烈依赖性。最后,我们在数值计算中重现了依赖于晶格类型的传输行为,排除了这些发现的外部实验原因。

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