Algorri J F, Zografopoulos D C, Ferraro A, García-Cámara B, Beccherelli R, Sánchez-Pena J M
Opt Express. 2019 Mar 4;27(5):6320-6330. doi: 10.1364/OE.27.006320.
In this work, a dielectric metasurface consisting of hollow dielectric nanocuboids, with ultrahigh quality factor, is theoretically proposed and demonstrated. The variation of the hole size of the cuboid allows for the tuning of the resonant anapole mode in the nanoparticles. The metasurface is designed to operate in two complementary modes, namely electromagnetically induced transparency and narrowband selective reflection. Thanks to the non-radiative nature of the anapole resonances, the minimal absorption losses of the dielectric materials, and the near-field coupling among the metasurface nanoparticles, a very high quality factor of Q=2.5×10 is achieved. The resonators are characterized by a simple bulk geometry and the subwavelength dimensions of the metasurface permit operation in the non-diffractive regime. The high quality factors and strong energy confinement of the proposed devices open new avenues of research on light-matter interactions, which may find direct applications, e.g., in non-linear devices, biological sensors, laser cavities, and optical communications.
在这项工作中，从理论上提出并论证了一种由具有超高品质因数的中空介电纳米立方体组成的介电超表面。长方体孔尺寸的变化允许对纳米颗粒中共振的无偶极模式进行调谐。该超表面被设计为以两种互补模式运行，即电磁诱导透明和窄带选择性反射。由于无偶极共振的非辐射特性、介电材料的最小吸收损耗以及超表面纳米颗粒之间的近场耦合，实现了非常高的品质因数Q = 2.5×10。这些谐振器的特点是具有简单的整体几何形状，并且超表面的亚波长尺寸允许在非衍射区域中运行。所提出器件的高品质因数和强能量限制为光与物质相互作用的研究开辟了新途径，这可能会在例如非线性器件、生物传感器、激光腔和光通信等方面找到直接应用。
