高品质因子表面晶格共振  

High-Q Surface Lattice Resonances

作　　者：杜艺璇 敖献煜 蔡阳健 Du Yixuan;Ao Xianyu;Cai Yangjian(School of Physics and Electronics,Shandong Normal University,Jinan 250358,Shandong,China)

机构地区：[1]山东师范大学物理与电子科学学院,山东济南250358

出　　处：《光学学报》2023年第16期62-73,共12页Acta Optica Sinica

基　　金：国家重点研发计划(2022YFA1404800,2019YFA0705000);国家自然科学基金(12074227,12192254,11974218,92250304)。

摘　　要：表面晶格共振源于周期阵列的衍射耦合,理论上可以获得高品质因子,并可有效增强光与背景环境中物质的相互作用。本文首先介绍在垂直入射激发条件下金属及高折射率介质纳米颗粒阵列中表面晶格共振的基本性质以及实现高品质因子的技术手段;然后,介绍基于反射镜上高深宽比介质纳米柱阵列在非对称折射率环境实现高品质因子表面晶格共振的研究进展;最后,探讨目前研究存在的局限以及后续的努力方向。Significance High-Q resonances that confine the light energy at subwavelength scales have applications in various fields such as micro/nano-lasers,fluorescence enhancement,and optical sensing.Extreme light localization has been realized by surface plasmons squeezed in plasmonic nanogaps,whereas there is intrinsic energy dissipation by electron oscillations on metal surfaces.In contrast,high-index dielectric nanostructures supporting Mie-type electric and magnetic resonances exhibit low optical dissipation but only moderate field confinement.When plasmonic or high-index dielectric nanoparticles are arranged into periodic arrays,diffractive coupling in the plane of periodic arrays may occur.This can suppress the radiative damping of individual nanoparticles,and produce surface lattice resonance(SLR)modes with significantly higher(|E|2/|E0|2>103)field enhancements and much higher quality factors compared with isolated nanoparticles.The last two decades have seen significant progress in SLRs supported by metallic and high-index dielectric nanoparticle arrays under normal incident excitation.However,due to limitations in the involved materials and available nanofabrication methods,there is still a series of challenges in achieving a high Q-factor in the visible regime,especially in asymmetric refractive-index environments.Thus,it is necessary to summarize the existing studies to guide the future development of this field more rationally.Progress We first introduce the basic properties of SLRs in metallic and high-index dielectric nanoparticle arrays under normal incident excitation.The periodic lattices are usually generated by various top-down lithography methods.The difficulty in experimentally achieving SLRs with a high Q-factor from noble metal nanoparticle arrays is that the precise fabrication of defect-free nanoparticle arrays is hard.One strategy to overcome optical dissipation and reduce the linewidth of SLRs is to shrink the particle size relative to the lattice spacing.Reshef et al.at the University of Otta

关 键 词：表面模 衍射 表面等离激元 MIE散射 

分 类 号：O436[机械工程—光学工程]