零折射率异向介质中的光子本征态
Trapping Light in Plain Sight: Embedded Photonic Eigenstates in Zero-Index Metamaterials
摘要：
限制电磁能对于增强光-物质相互作用至关重要，对科学和技术具有重要意义。在这里，我们讨论了在开放结构中捕获和限制光的机会，基于零折射率超材料实现的辐射连续体内嵌入本征态的概念。基于我们的分析所提供的物理见解，我们提出了一个通用平台，可以在外部照明下在开放结构中实现极高的场增强。支持嵌入本征态的结构是物理系统中可以驯服极端（原则上是无界的）响应的一个罕见例子。我们提出的设计配方，以实现连续的束缚态也提供了一个简单的模型，允许测试的重要问题，围绕嵌入本征态的概念，如它们对光子态的局部密度的影响。我们的研究结果有助于澄清哪些纳米光学和无线电波应用可能受益于这种不寻常和奇异的反应。
英文摘要：
Confining electromagnetic energy is crucial to enhance light-matter interactions, with important implications for science and technology. Here, we discuss the opportunities offered by trapping and confining light in open structures, based on the concept of embedded eigenstates within the radiation continuum enabled by zero-index metamaterials. Building upon the physical insights offered by our analysis, we put forward a general platform that allows realizing extremely high field enhancements in open structures under external illumination. Structures supporting embedded eigenstates represent a rare example of physical systems in which extreme - in principle unbounded - responses can be tamed. Our proposed design recipe to realize bound states in the continuum also offers a simple model that allows testing important questions that surround the concept of embedded eigenstates, such as their effect on the local density of photonic states. Our findings help clarifying which nano-optical and radio-wave applications may benefit from this unusual and singular response.
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