论文部分内容阅读
本文研究了由椭圆形金纳米颗粒组成的周期阵列在对称介质环境以及放置在介质波导表面两种体系下的Fano共振特性.我们将衍射表面波或波导本征模调谐到金纳米颗粒的局域等离激元共振频率附近,使其满足了通常意义上Fano共振产生的条件,即窄线宽和宽线宽的模式在共振能量上的重叠.我们发现,当仅满足这一条件时,Fano共振并不能被有效激发.我们通过对共振模式场分布的研究分析,阐述了Fano共振的激发还必须满足两种不同线宽的模式需要具有相同的电场分量.我们的研究结果将有助于更好地理解Fano共振的物理意义,对于设计基于Fano共振的微纳光子结构和器件有着重要的指导意义.
In this paper, we study the Fano resonant characteristics of a periodic array of elliptical gold nanoparticles in a symmetric media environment and two systems placed on a dielectric waveguide surface. We tune the diffracted surface wave or waveguide eigenmode to the local area of the gold nanoparticle Near the plasmon resonance frequency, it satisfies the condition of Fano resonance in the usual sense, that is, the overlap of resonance modes with narrow linewidth and wide linewidth.We find that when only this condition is satisfied, Fano Resonance can not be effectively excited.We study the resonance mode field distribution and illustrate that the excitation of Fano resonance must satisfy the two different linewidth modes and need the same electric field component.The results of our study will help more A good understanding of the physical significance of Fano resonance is of great guiding significance for the design of micro-nano photonic structures and devices based on Fano resonance.