基于非对称纳米颗粒阵列的垂直与平行表面晶格共振  

Formation of Orthogonal and Parallel Surface-Lattice Resonances with Asymmetric Nanoparticle Array

作　　者：侯浩杰 刘钧妍 肖博文 朱明琦 李孟春 Hou Haojie;Liu Junyan;Xiao Bowen;Zhu Mingqi;Li Mengchun(Key Laboratory of Advanced Transducers and Intelligent Control System of the Ministry of Education* Taiyuan, Shanxi 030024, China;College of Physics and Optoelectronics, Taiyuan University of Technology, Taiyuan, Shanxi 030024, China)

机构地区：[1]新型传感器与智能控制教育部重点实验室,山西太原030024 [2]太原理工大学物理与光电工程学院,山西太原030024

出　　处：《激光与光电子学进展》2019年第15期197-203,共7页Laser & Optoelectronics Progress

基　　金：山西省国际合作基金(17101952)

摘　　要：在贵金属纳米颗粒阵列中所形成的表面晶格共振能够有效抑制体系辐射损耗、提高共振品质因子、增大局域场强,已被广泛用于设计高性能微纳光子器件。实现垂直与平行表面晶格共振的同时激发对阵列结构光学响应的调制及应用具有重要意义。本文设计了由L-形纳米天线构成的阵列结构,计算了成键模式和反成键模式与瑞利异常耦合的光学响应,获得了在消光谱上能够同时形成上述两种表面晶格共振的结论。结果表明,其成键与反成键局域共振模式都可以实现与瑞利异常的耦合,从而激发垂直与平行表面晶格共振。这些特性使得这种非对称纳米颗粒阵列在微纳光子器件的设计方面具有重要的应用价值。Surface-lattice resonances generated by using noble-metallic nanoparticle arrays can effectively suppress radiation loss,thereby improving the resonance quality factor and increasing localized field intensity.Surface-lattice resonances have been widely used for designing high-performance micro-nano photonic devices.Realizing the simultaneous excitation of orthogonal and parallel surface-lattice resonances is crucial for manipulating the collective responses of nanoparticle arrays,which is also useful for practical applications.Herein,we design an array structure composed of L-shaped nanoantennas.Furthermore,we investigate the optical response caused by the coupling between the Rayleigh anomaly and bonding/antibonding modes.We find that the two kinds of surfacelattice resonances can be excited simultaneously in extinction spectra.Calculation results reveal that the bonding/antibonding modes can be used to couple with Rayleigh anomaly,thereby leading to the formation of orthogonal and parallel surface-lattice resonances.These properties make asymmetric nanoparticle arrays become promising platforms for designing micro-nano photonic devices.

关 键 词：光电子学 表面等离子体光子学 表面等离激元共振 时域有限差分法 表面晶格共振 非对称纳米颗粒 

分 类 号：O539[理学—等离子体物理]