基于非对称纳米棒二聚体阵列的多重表面晶格共振

Multiple Surface Lattice Resonances with Asymmetric Nanorod Dimer Array

摘要:

贵金属纳米颗粒阵列结构中的多重表面晶格共振能够在多个波段同时抑制体系辐射损耗,增大共振品质因子和局域场强,这对多波长相关微纳光子器件的设计具有重要意义,如何实现对多重表面晶格共振的有效操控是实现这些应用的关键。提出采用非对称纳米棒二聚体阵列结构产生和调控多重表面晶格共振。由于纳米棒结构的各向异性,其构成的二聚体结构具有丰富的局域共振响应,并且依赖于二聚体的排列方式,可以进一步调整局域共振,故由非对称纳米棒二聚体阵列可以产生并实现对多重表面晶格共振的有效操控。研究结果表明,由端对端和边对边排列的非对称纳米棒二聚体阵列结构能够激发起不同的表面晶格共振,其共振峰位、品质因子等可以通过改变两个正交方向上的周期实现有效调控,这对基于多重表面晶格共振的微纳光子器件的设计具有重要的应用价值。

Abstract:

Multi-surface lattice resonance in noble metal nanoparticle array structure can simultaneously suppress system radiation loss and increase resonance quality factor and local field strength in multiple bands, which is of great significance for the design of multi-wavelength nano photonic/related micro devices. How to achieve effective manipulation of multiple surface lattice resonances is the key point. In this paper, it is proposed to achieve generation and regulation of multiple surface lattice resonances by using asymmetric nanorod dimer array structures. Due to the anisotropy of the nanorod structure, the formed dimer structure has a rich local resonance response, and the local resonance can be further adjusted based on the arrangement of the dimer. Therefore, effective manipulation of multiple surface lattice resonances can be generated and achieved by asymmetric nanorod dimer arrays. Test results show that the asymmetric nanorod dimer array structure arranged in end-to-end and edge-to-edge can stimulate different surface lattice resonances. Its resonance peak position, quality factor and other indexes can be effectively controlled by changing the period of two orthogonal directions.