Perfectly-reflecting guided-mode-resonant photonic lattices possessing Mie modal memory
Perfectly-reflecting guided-mode-resonant photonic lattices possessing Mie modal memory
复制标题
DOI：
10.1364/oe.434359
复制
发表时间：
2021-08-16
期刊：
影响因子：
3.8
通讯作者：
Magnusson, Robert
中科院分区：
文献类型：
--
作者：
Ko, Yeong Hwan;Razmjooei, Nasrin;Magnusson, Robert
根据材料和设计参数的选择，共振周期性纳米结构可在小或大光谱带宽上提供完美的反射。这种效应几十年来一直为人所知，通过通常称为谐振光栅、超材料和超表面的一维和二维结构在理论上和实验上观察到。这种非凡现象的物理原因是由亚波长范围内的倏逝衍射级激发的横向布洛赫模式介导的导模共振。近年来，数百篇论文宣称法布里-珀罗或米氏共振是周期性超表面所拥有的完美反射的基础。处理简单的一维圆柱棒晶格，在这里我们清楚明确地表明米氏共振不会引起完美反射。事实上，布洛赫模式介导的零级反射率的光谱位置主要由晶格周期通过其对晶格的均匀有效介质折射率的直接影响来控制。一般来说，完美反射看起来远离米氏共振。然而，当横向漏模场分布接近孤立粒子米氏场分布时，共振轨迹趋于米氏共振波长。晶格场“记住”孤立粒子场的事实在这里被称为“米氏模态记忆”。在通过折射率匹配子层擦除米氏记忆时，我们表明，随着谐振轨迹接近均质化有效介质波导轨迹，完美反射仍然存在。这里提出的结果将有助于阐明一般共振光子晶格的物理基础。 (C) 2021 年美国光学协会根据 OSA 开放获取出版协议的条款
Resonant periodic nanostructures provide perfect reflection across small or large spectral bandwidths depending on the choice of materials and design parameters. This effect has been known for decades, observed theoretically and experimentally via one-dimensional and two-dimensional structures commonly known as resonant gratings, metamaterials, and metasurfaces. The physical cause of this extraordinary phenomenon is guided-mode resonance mediated by lateral Bloch modes excited by evanescent diffraction orders in the subwavelength regime. In recent years, hundreds of papers have declared Fabry-Perot or Mie resonance to be the basis of the perfect reflection possessed by periodic metasurfaces. Treating a simple one-dimensional cylindrical-rod lattice, here we show clearly and unambiguously that Mie resonance does not cause perfect reflection. In fact, the spectral placement of the Bloch-mode-mediated zero-order reflectance is primarily controlled by the lattice period by way of its direct effect on the homogenized effective-medium refractive index of the lattice. In general, perfect reflection appears away from Mie resonance. However, when the lateral leaky-mode field profiles approach the isolated-particle Mie field profiles, the resonance locus tends towards the Mie resonance wavelength. The fact that the lattice fields "remember" the isolated particle fields is referred here as "Mie modal memory." On erasure of the Mie memory by an index-matched sublayer, we show that perfect reflection survives with the resonance locus approaching the homogenized effective-medium waveguide locus. The results presented here will aid in clarifying the physical basis of general resonant photonic lattices. (C) 2021 Optical Society of America under the terms of the OSA Open Access Publishing Agreement