标题： 在纳米孔硅超表面的偶极子模式中的光场限制 显示英文标题

标题： On the optical field confinement at the anapole mode in nanohole silicon metasurfaces

摘要： 最近，研究人员展示了具有非辐射态的超表面的各种类型，包括偶极子态。 这些超表面在光学领域有各种应用，主要与光学场的限制有关。 但仅存在偶极子态本身并不能使人们利用这一特性。 例如，Ospanova 等人 [\textit{激光与光子学评论}, 2018, vol. 12, p. 1800005] 在硅片中展示了一个具有可见光范围内偶极子模式的分组纳米孔阵列。 在这项工作中，证明了尽管所提出的纳米结构中存在偶极子模式，但并未达到有价值的电场限制。 因此，通过这种纳米结构无法获得最期望的偶极子态的应用。 如这里所示，上述纳米结构可以被具有不同元原子且具有更大电场限制的正方形纳米孔阵列所替代。 显示英文摘要

摘要： Recently, researchers demonstrated numerous types of the metasurfaces with non-radiating states including the anapole ones. These metasurfaces have promising properties for various applications in optics which are mainly connected with the optical field confinement. But by itself, the existence of the anapole state does not make one available to exploit this feature. For example, Ospanova et al. [\textit{Laser \& Photonics Rev.}, 2018, vol. 12, p. 1800005] presented a grouped nanohole array in silicon slab possessing anapole mode in visible range. In this work, it is proved that despite of the existence of the anapole mode in the proposed nanostructure the valuable electric field confinement is not reached. Thus most expected uses of the anapole state cannot be gained through this nanostructure. As demonstrated here, the aforementioned nanostructure may be replaced by the square nanohole array having the anapole state with different meta-atom and much larger electric field confinement.