期刊
JOURNAL OF LIGHTWAVE TECHNOLOGY
卷 39, 期 22, 页码 7217-7222出版社
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/JLT.2021.3113696
关键词
Gold; Absorption; Metamaterials; Plasmons; Three-dimensional displays; Substrates; Optical surface waves; Dual-band perfect absorption; metamaterials; sensing; Surface plasmons; ultranarrow bandwidth
资金
- National Natural Science Foundation of China (NSFC) [11704184, 12074151]
- Jiangsu Key Laboratory of Atmospheric Environment Monitoring and Pollution Control [KHK2007]
- Science Innovation Foundation for Young Scientists of Nanjing Forestry University [CX2019024]
- Natural Science Foundation of Zhejiang Province [LY14A040004, LQ17C100002]
By placing the 3D metamaterial of Au VSRRs directly onto the Au substrate, ultra-narrow dual-band perfect absorption in the visible range for high-sensitivity sensing can be achieved. The proposed 3D metamaterial exhibits ultrahigh sensitivity and figure of merit in the near-infrared regime, holding potential applications in label-free biosensing.
We theoreticallydemonstrate the realization of the ultranarrow dual-band perfect absorption at visible range in 3D metamaterials comprising Au vertical split-ring resonators (VSRRs) array above a thick Au film for high-sensitivity sensing. By placing the 3D metamaterial of Au VSRRs directly onto the Au substrate to remove the dielectric substrates effect, the simulated results reveal that ultranarrow dual-band perfect absorption with the two narrow absorption bandwidth of 7.3 nm and 1.1 nm in the visible regime can be excited from pure magnetic plasmon (MP) resonance and via the strong coupling between the MP resonance of the VSRRs and the surface plasmons polaritons (SPPs) propagating on the Au film, respectively. Moreover, coupling effects in the VSRRs with different structural parameters also are studied in detail. Because of the ultranarrow dual-band perfect absorption of the VSRRs being extremely sensitive to the changes of the material surrounding, our proposed 3D metamaterial exhibits ultrahigh sensitivity (S = 918 nm/RIU, S* = 680/RIU) and figure of merit (FoM = 835, FoM* = 4.5x10(6)) in near-infrared regime, which hold potential applications in label-free biosensing.
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