| Citation: | LV Jing-wei, WANG De-bao, LIU Chao, LIU Qiang, WANG Jian-xin, YANG Lin, MU Hai-wei, PAUL K CHU. Multiple Fano resonance properties of nanoring-heptamer metal-dielectric structures[J]. Chinese Optics, 2023, 16(1): 214-227. doi: 10.37188/CO.2022-0170
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In order to achieve tunable multiple Fano resonance characteristics and design a refractive index sensor with high sensitivity, a nanoring-heptamer metal-dielectric composite nanoantenna structure is proposed, and the influencing factors and variation rules of its Fano resonance characteristics are studied by using the Finite Element Method (FEM). Researches show that Fano resonance characteristics of the hybrid nano-antenna is sensitive to the changes of the height, incident angle and internal gap. In addition, the electric intensity and the Purcell factor (PF) under the excitation of the electric dipole source can reach 134.74 V/m and 3214 respectively, which greatly enhances the electric intensity near the center of the nanoantenna. The hybrid nanoantenna has high Sensitivity (S) (1400 nm/RIU) and Figure of Merit (FOM) (17 RIU−1), respectively, which can be used as two significant performance indices for evaluating the refractive index sensor with high sensitivity. This paper provides a feasible way to realize the tunability of Fano resonance in the composite nanoantenna and a solid theoretical basis for practical applications such as surface-enhanced Raman scattering, quantum emitters, and refractive index sensors.
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