At optical frequencies, we design an anisotropic metasurface to realize high-Q perfect absorption in numerical calculation. By establishing the Norton equivalent network model, we first reveal that the root cause of this phenomenon is the coupling excitation of the localized surface plasmon (LSP) mode and the surface plasmon polariton (SPP) mode. This absorber can realize bifunctional switching and is expected to realize the energy conversion of photons–SPP–photons. Meanwhile, we analyze the control of the structural design on high-Q perfect absorption. This research will provide theoretical guidance for the further development of applications related to high-Q perfect absorption such as absorption filters with specific wavelengths and narrow band photon emitters.

中文翻译：

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LSP和SPP模式耦合引起的高Q完美吸收

在光频率处，我们设计了各向异性的超表面，以在数值计算中实现高Q完美吸收。通过建立诺顿等效网络模型，我们首先揭示出此现象的根本原因是局部表面等离激元（LSP）模式和表面等离激元极化（SPP）模式的耦合激发。该吸收器可以实现双功能切换，并且有望实现光子– SPP –光子的能量转换。同时，我们分析了结构设计对高Q值完美吸收的控制。这项研究将为进一步发展与高Q完美吸收有关的应用提供理论指导，例如具有特定波长的吸收滤光片和窄带光子发射器。