Fano resonance with high local field enhancement under azimuthally polarized excitation
Wuyun Shang, Fajun Xiao, Weiren Zhu, Hongsen He, Malin Premaratne, Ting Mei, Jianlin Zhao
SCIENTIFIC REPORTS | NATURE PUBLISHING GROUP | Published : 2017
Being an enabling technology for applications such as ultrasensitive biosensing and surface enhanced spectroscopy, enormous research interests have been focused on further boosting the local field enhancement at Fano resonance. Here, we demonstrate a plasmonic Fano resonance resulting from the interference between a narrow magnetic dipole mode and a broad electric dipole mode in a split-ring resonator (SRR) coupled to a nanoarc structure. Strikingly, when subjected to an azimuthally polarized beam (APB) excitation, the intensity enhancement becomes more than 60 times larger than that for a linearly polarized beam (LPB). We attribute this intensity enhancement to the improved conversion effic..View full abstract
Awarded by National Natural Science Foundation of China (NSFC)
Awarded by Fundamental Research Funds for the Central Universities
Awarded by Australian Research Council through its Discovery Grant scheme
This work was supported by the National Natural Science Foundation of China (NSFC) (11634010, 61675170, 61308031, and 61377035), the Fundamental Research Funds for the Central Universities (3102015ZY062), and Australian Research Council through its Discovery Grant scheme under Grant DP140100883.