用于剪裁散射的纳米谐振器的本征多极内容
Intrinsic multipolar contents of nanoresonators for tailored scattering
摘要：
我们介绍了一种理论和计算方法来设计共振物体，如纳米天线或元原子，表现出定制的多极响应。与依赖于在特定激励下对象的散射响应的多极分析的常见方法相比，我们提出设计\textit{intrinsic}（即，激励无关）多极内容和物体的自然共振（或准正规模式）的光谱特性。一个严格的数值方法多极分解的谐振在复杂的频率，随着一个分析模型传达一个直接的物理洞察到多极矩诱导的谐振器。我们的设计策略是通过设计一个亚波长光学谐振腔展示Janus谐振，提供侧依赖耦合到波导在整个线宽的谐振和宽的角度范围内的线性偏振入射平面波。该方法适用于所有类型的波，并可能打开新的视角亚波长尺度操纵的散射和发射。
英文摘要：
We introduce a theoretical and computational method to design resonant objects, such as nanoantennas or meta-atoms, exhibiting tailored multipolar responses. In contrast with common approaches that rely on a multipolar analysis of the scattering response of an object upon specific excitations, we propose to engineer the \textit{intrinsic} (i.e., excitation-independent) multipolar content and spectral characteristics of the natural resonances -- or quasinormal modes -- of the object. A rigorous numerical approach for the multipolar decomposition of resonances at complex frequencies is presented, along with an analytical model conveying a direct physical insight into the multipole moments induced in the resonator. Our design strategy is illustrated by designing a subwavelength optical resonator exhibiting a Janus resonance that provides side-dependent coupling to waveguides over the full linewidth of the resonance and on a wide angular range for linearly-polarized incident planewaves. The method applies to all kinds of waves and may open new perspectives for subwavelength-scale manipulation of scattering and emission.
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