【摘要】 利用FDTD研究了Ag-SiO₂纳米结构的法诺共振。m_j（j=2,3）模的共振峰随银膜水平长度l的增长而红移。法诺共振与银-空气、SiO₂周期结构和SiO₂有关。随着SiO₂横向长度L的增加,法诺现象越来越明显。此外,法诺共振还与银膜的介电常数（实部的负值-ε′_m）密切相关。在非周期性Ag-空气-氧化硅结构中,当-ε′_m=4 000和-ε′_m=6 000时,可以观察到明显的法诺共振。更多还原

【Abstract】 Fano resonances in Ag-Air-SiO₂ nanostructure were investigated by Finite-difference time-domain（ FDTD）. It could be observed a redshift with the growth of horizontal length l of silver film for the resonance peaks of the modes mj（ j = 2,3）. Fano resonance was related with the Ag-Air-SiO₂ periodic structure and SiO₂. The modes mj（ j = 2,3） presented a redshift and the Fano was becoming more and more obvious with the increment of transverse length L of SiO₂. In addition,the Fano resonances were also closely related with the permittivity（ negative value of the real part） of the silver film. The Fano resonances could be obtained when-εm’= 4 000 and-εm’= 6 000 in the aperiodic Ag-Air-SiO₂ structure.更多还原