Song Duofu, Wang Hong, Deng Meng, Wang Yi
Appl Opt. 2021 Apr 20;60(12):3458-3463. doi: 10.1364/AO.422295.
The toroidal dipole (TD) plays an important role in light-matter interactions. In this paper, a lattice-perturbed dielectric nanohole array structure has been put forward to excite dominant TD Fano resonances in the near-infrared region. Herein, the numerical investigations and experimental demonstrations have been performed to characterize the TD Fano resonances with a series of lattice perturbations. The scattering power of TD and quality ()-factor of the resonance can be tailored by tuning perturbation. By using the lattice perturbation of 53 nm, the highest experimental -factor of 584 is obtained.
环形偶极子（TD）在光与物质相互作用中起着重要作用。本文提出了一种晶格微扰介电纳米孔阵列结构，以激发近红外区域的主导TD法诺共振。在此，通过一系列晶格微扰进行了数值研究和实验演示，以表征TD法诺共振。通过调整微扰可以调整TD的散射功率和共振品质因数（Q）。使用53nm的晶格微扰，获得了高达584的最高实验Q因数。
