Moiré structures are receiving increasing attention in nanophotonics as they support intriguing optical phenomena. In the so-called “magic configuration,” one-dimensional moirés give rise to fully dispersionless energy bands known as “flatbands,” where the light is tightly localized within each supercell of the periodic moiré. The goal of this investigation is to determine to what extent the confinement of light, observed in periodic structures, is preserved in microcavities of finite size. Here we analyze the optical response of finite moiré structures consisting of one, two, or more supercells of 1D moiré. Our calculations reveal that for a single-supercell cavity, the magic configuration does not impact the electric field confinement at the wavelength of the flatband modes. However, when three or more supercells are connected, we show that the coupling between supercells is canceled at the “magic configuration,” resulting in highly confined modes with a quality factor greater than 106${10^6}$ and exhibiting the characteristics of a quasi-bound state in the continuum where optical losses are eliminated through a destructive interference process.

中文翻译：

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莫尔光子晶格中的非常规光限制需要多少个超级电池？

莫尔结构在纳米光子学中受到越来越多的关注，因为它们支持有趣的光学现象。在所谓的“神奇配置”中，一维莫尔条纹产生了被称为“平带”的完全无色散的能带，其中光紧密地集中在周期性莫尔条纹的每个超级单元内。这项研究的目的是确定在周期性结构中观察到的光的限制在多大程度上保留在有限尺寸的微腔中。在这里，我们分析由一个、两个或多个一维莫尔条纹超晶胞组成的有限莫尔条纹结构的光学响应。我们的计算表明，对于单超级单元腔，神奇配置不会影响平带模式波长处的电场限制。然而，当三个或更多超级单元连接时，我们发现超级单元之间的耦合在“神奇配置”下被取消，导致品质因数大于10 6${10^6}$的高度受限模式，并表现出准束缚态的特征通过相消干涉过程消除光学损耗的连续体。