Tunable Multipolar Fano Resonances and Electric Field Enhancements in Au Ring-Disk Plasmonic Nanostructures

Materials

Hang Lin¹  Jing Huang¹  Rong Qiu¹  Zao Yi¹  Cuiping Liang¹ 

[1]Joint Laboratory for Extreme Conditions Matter Properties, Southwest University of Science and Technology, Mianyang 621010, China

关键词: Au ring-disk nanostructures;    Fano resonances;    multipolar;    finite-difference time-domain;   

DOI  :  10.3390/ma11091576

来源: DOAJ

【 摘 要 】

We theoretically research the characteristics of tunable multipolar Fano resonances in novel-designed Au ring-disk plasmonic nanostructures. We systematically study some structural parameters that influence the multipolar Fano resonances of the nanostructures. Adjustment of the radius (R1 and R2) of the Au ring, the radius (R3) of the Au disk and the thickness (H) of the Au ring-disk can effectively adjust the multipolar Fano resonances. The complex field distributions excited by a Au ring-disk can produce dark resonance modes. At the frequency of the multipolar Fano resonances, strong localized field distributions can be obtained. The Fano resonances exhibit strong light-extinction properties in Au ring-disk nanostructures, which can be applied to an optical tunable filter and optical switch.

【 授权许可】

Unknown