Polar dielectric nanoresonators can support hybrid photon-phonon modes termed surface phonon polaritons with length scales below the diffraction limit. In the deep subwavelength regime the optical response of these systems was shown to diverge from that predicted through a standard dielectric description. Recently, we developed an analytical, dielectric approach and applied it to spheres and planar heterostructures, reproducing anomalous features observed in experiment and microscopic calculations. In this Rapid Communication we develop tools to describe the nonlocal response of polar nanoresonators of arbitrary symmetry, and use them to investigate systems with nanogaps and nanolayers of practical technological relevance. We demonstrate that the available field enhancement is strongly reduced, as the electromagnetic energy leaks away from the hot spots, while phononic resonances are shifted by resonator effects.

中文翻译：

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声子非局域性对纳米间隙和纳米层极性共振器的影响

极性电介质纳米谐振器可以支持混合光子-声子模式，这种模式称为表面声子极化子，其长度尺度低于衍射极限。在深亚波长范围内，这些系统的光学响应被证明与通过标准介电描述所预测的有所不同。最近，我们开发了一种解析介电方法，并将其应用于球体和平面异质结构，重现了在实验和微观计算中观察到的异常特征。在本快速通信中，我们开发了描述任意对称极性纳米谐振器的非局部响应的工具，并使用它们来研究具有实际技术相关性的具有纳米间隙和纳米层的系统。我们证明了可用的场增强大大降低了，