Abstract. We design and numerically investigate an all-dielectric metasurface, constructed of four open resonant rings described by the group Cs and located with a cross-shaped resonator between them, that realizes double toroidal switching, in which switching from a toroidal dipole to a quadrupole response occurs in two separate frequency regimes. It is shown that the toroidal dipole can be dynamically switched on, whereas the pronounced toroidal quadrupole can be switched off simultaneously at orthogonal orientations from same metasurface, and vice versa, through changing the polarization of the incident light. The maximum value of modulation depth for the toroidal dipole and quadrupole responses reached 76% and 83%, respectively. Active switching of a toroidal dipole into a quadrupole has potential applications in designing efficient filters and modulators.

中文翻译：

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基于全介电超表面中不同多极响应的双环形开关

摘要。我们设计并数值研究了一个全介电超表面，由 Cs 组描述的四个开放谐振环构成，并在它们之间放置一个十字形谐振器，实现双环形切换，其中从环形偶极子切换到四极子响应发生在两个不同的频率范围内。结果表明，环形偶极子可以动态打开，而明显的环形四极子可以在同一超表面的正交方向上同时关闭，反之亦然，通过改变入射光的偏振。环形偶极子和四极子响应的调制深度最大值分别达到了 76% 和 83%。