Resonance properties of isolated-particle optical lattices: Antireflection-quenched Mie scattering and Mie modal memory
Resonance properties of isolated-particle optical lattices: Antireflection-quenched Mie scattering and Mie modal memory
复制标题
DOI：
10.1117/12.2607963
复制
发表时间：
2022-03
期刊：
影响因子：
--
通讯作者：
R. Magnusson;Y. Ko;Nasrin Razmjooei;F. A. Simlan;Hafez Hemmati
中科院分区：
文献类型：
--
作者：
R. Magnusson;Y. Ko;Nasrin Razmjooei;F. A. Simlan;Hafez Hemmati
用严格的电磁学方法对真空中由隔离粒子阵列组成的周期性光晶格进行了处理。这些结构具有许多有趣的特性，包括根据材料和设计参数的选择，在小或大的光谱带宽上具有完美的反射。相关的光谱表达式已经在理论和实验中通过一维（1D）和二维（2D）结构被观察到，通常被称为共振光栅、超材料和超表面。完美反射和相关特性的物理原因是由亚波长区域中倏逝衍射阶激发的侧向布洛赫模式介导的导模共振。本文综述了近年来关于局部米氏共振和导模晶格共振在周期性粒子集引起共振反射中的分化的研究结果。我们处理一个典型的由介电球组成的二维周期阵列。为了阻止米氏共振，我们在球体上应用了增透（AR）涂层。涂覆球和未涂覆球的反射率图表明，在两种情况下都能保持完美的反射。我们发现ar包覆的球的Mie散射效率大大降低。此外，在一维圆柱棒型晶格中，我们研究并比较了周期性组装和组成孤立粒子的局部场分布。一般来说，晶格和粒子共振波长不同。当侧向漏模场曲线接近孤立粒子Mie场曲线时，共振轨迹趋向于Mie共振波长。这种对应关系被称为Mie模态记忆。这些基本原理可以帮助区分Mie效应和漏模效应，在这类光学器件中产生观测光谱，同时阐明整个光谱域的基本共振特性。
Periodic optical lattices consisting of isolated-particle arrays in vacuum are treated with rigorous electromagnetics. These structures possess a wealth of interesting properties including perfect reflection across small or large spectral bandwidths depending on the choice of materials and design parameters. Pertinent spectral expressions have been observed theoretically and experimentally via one-dimensional (1D) and two-dimensional (2D) structures commonly known as resonant gratings, metamaterials, and metasurfaces. The physical cause of perfect reflection and related properties is guided-mode resonance mediated by lateral Bloch modes excited by evanescent diffraction orders in the subwavelength regime. Here, we review recent results on differentiation of local Mie resonance and guided-mode lattice resonance in causing resonant reflection by periodic particle assemblies. We treat a classic 2D periodic array consisting of dielectric spheres. To disable Mie resonance, we apply antireflection (AR) coatings to the spheres. Reflectance maps for coated and uncoated spheres demonstrate that perfect reflection persists in both cases. We find that the Mie scattering efficiency of an AR-coated sphere is greatly diminished. Additionally, in a 1D cylindrical rod-type lattice, we investigate and compare local field profiles in periodic assemblies and in the constituent isolated particles. In general, the lattice and particle resonance wavelengths differ. When the lateral leaky-mode field profiles approach the isolated-particle Mie field profiles, the resonance locus tends towards the Mie resonance wavelength. This correspondence is referred to as Mie modal memory. These fundamentals may help distinguish Mie effects and leaky-mode effects in generating the observed spectra in this class of optical devices while elucidating the basic resonance properties across the entire spectral domain.