Ag-SiO2纳米结构中的法诺共振（英文）

Fano Resonances in Ag-Air-SiO2 Nanostructure

利用FDTD研究了Ag-SiO 2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、SiO 2周期结构和SiO 2有关。随着SiO 2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。

Fano resonances in Ag-Air-SiO 2 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 m j(j=2,3).Fano resonance was related with the Ag-Air-SiO 2 periodic structure and SiO 2.The modes m j(j=2,3)presented a redshift and the Fano was becoming more and more obvious with the increment of transverse length L of SiO 2.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-ε′m=4 000 and-ε′m=6 000 in the aperiodic Ag-Air-SiO 2 structure.