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Multiple Fano resonance properties of nanoring-heptamer metal-dielectric structures

LV Jing-wei,WANG De-bao,LIU Chao,LIU Qiang,WANG Jian-xin,YANG Lin,MU Hai-wei,PAUL K CHU

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吕靖薇, 王德宝, 刘超, 刘强, 王建鑫, 杨琳, 牟海维, 朱剑豪. 纳米环-七聚体金属-介电结构的多重Fano共振特性[J]. , 2023, 16(1): 214-227. doi: 10.37188/CO.2022-0170
引用本文: 吕靖薇, 王德宝, 刘超, 刘强, 王建鑫, 杨琳, 牟海维, 朱剑豪. 纳米环-七聚体金属-介电结构的多重Fano共振特性[J]. , 2023, 16(1): 214-227.doi:10.37188/CO.2022-0170
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
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

纳米环-七聚体金属-介电结构的多重Fano共振特性

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  • 中图分类号:O436

Multiple Fano resonance properties of nanoring-heptamer metal-dielectric structures

doi:10.37188/CO.2022-0170
Funds:Supported by Natural Science Foundation Projects in Heilongjiang Province (No. LH2021F007);China Postdoctoral Science Foundation (No. 2020M670881);Study Abroad returnees merit-based Aid Foundation in Heilongjiang Province (No. 070-719900103);Northeastern Petroleum University Scientific Research Projects (No. 2019KQ74);Strategic Research Fund of the City University of Hong Kong (SRG) (No. 7005505)
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    Author Bio:

    Lv Jingwei (1991—), born in Daqing, Heilongjiang Province, lecturer, master supervisor, mainly engaged in the research of surface plasmon resonance technology and nano-functional materials. E-mail:lvjingwei2009123@126.com

    Liu Chao (1978—), born in Mulan, Heilongjiang Province, professor, doctoral supervisor, mainly engaged in the research of the basic theory and application of optical fiber surface plasmon resonance sensing, published more than 80 SCI papers in Opt. Exp, Nanomaterials, Opt. Mater. Exp., Res. Phys., Appl. Surf. Sci., IEEE Photon. Technol. Lett. and other journals, many of which were selected as high cited papers of ESI. E-mail:msm-liu@126.com

    Corresponding author:msm-liu@126.com
  • 摘要:

    为实现可调谐的多重Fano共振特性及设计高灵敏度折射率传感器,本文提出一种纳米环-七聚体金属-介电纳米天线结构,利用有限元方法(Finite Element Method, FEM)研究了Fano共振特性的影响因素和变化规律。研究表明,纳米环-七聚体金属-介电纳米天线的Fano共振特性对高度、入射角度和结构间隙的变化非常敏感;纳米天线的电场强度和电偶极源激发下的珀赛尔系数(Purcell factor, PF)可达134.74 V/m和3214,使得纳米天线中心位置附近的电场强度得到大幅增强;复合纳米天线结构具有较高的灵敏度S和品质因数FOM,分别为1400 nm/RIU和17 RIU−1,可作为评价高灵敏度折射率传感器的重要性能指标。本文为实现复合纳米天线结构中Fano共振的可调谐特性提供了一种可行途径,为表面增强拉曼散射、量子发射器和折射率传感器等实际应用奠定了坚实的理论基础。

  • 图 1纳米环-七聚体金属-介电复合结构示意图。(a)最内层硅圆柱结构;(b)中间层银圆柱结构;(c)单硅圆柱与六银柱组合体;(d)最外层硅介质圆环结构;复合结构的(e)二维模型和(f)三维模型

    Figure 1.Schematic diagram of the nanoring- heptamer metal-dielectric composite structure. (a) Innermost layer with silicon cylinder structure; (b) intermediate layer with silver cylinder structure; (c) single silicon cylinder and six-silver cylinders combination; (d) outermost layer with silicon dielectric ring structure; (e) 2D model and (f) 3D model of the composite structure

    图 2单硅圆柱、六银圆柱、硅银圆柱结构以及复合天线结构散射截面曲线图

    Figure 2.SCS curves of single silicon cylinder, six-silver cylinders, silicon-silver cylinder and composite nanostructures

    图 3谱线共振峰值处的电场图(a)~(c)和电荷分布图(d)~(f)

    Figure 3.Electric field (a)−(c) and charge distribution (d)−(f) at the formant of the spectral line

    图 4结构参数对散射谱线的影响示意图。(a)不同高度对散射强度及位置的影响;(b)不同入射角度对散射截面的贡献;(c)不同七圆柱间间隙对散射强度及位置的影响;(d)不同圆柱与圆环间隙对散射截面的贡献

    Figure 4.Schematic diagram of the influence of structural parameters on scattering spectral line. (a) Influence of different height on scattering intensity and position; (b) contribution of different incidence angles to the scattering cross section; (c) influence of different gaps between seven cylinders on scattering intensity and position; (d) contribution of different cylindrical and annular gaps to the scattering cross-section

    图 5所选ABCD4点处的归一化电场值。插图黑色圆点为四点的位置

    Figure 5.Normalized electric field values at the selected pointsA,B,CandD, and the black dots in the top right figure are the positions of the four points

    图 6电偶极子发射器分别位于ABCD4点时的珀赛尔系数。插图黑色圆点为四点的位置

    Figure 6.Purcell factor of the ED emitter at four pointsA,B,CandD, and the black dots in the top right figure are the positions of the four points

    图 7不同空气材料对散射截面的影响

    Figure 7.Influence of different air materials on scattering cross section

    表 1Sensitivity (S) of nanostructures changes with different materials

    Table 1.Sensitivity (S) of nanostructures changes with different materials

    First peak
    (nm/RIU)
    Second peak
    (nm/RIU)
    Third peak
    (nm/RIU)
    n=1.02 800 750 1400
    n=1.04 0 350 700
    n=1.06 550 400 700
    n=1.08 250 450 0
    n=1.10 300 400 700
    下载: 导出CSV

    表 2Figure of Merit (FOM) changes with different materials

    Table 2.Figure of Merit (FOM) changes with different materials

    First peak
    (RIU−1)
    Second peak
    (RIU−1)
    Third peak
    (RIU−1)
    n=1.02 1.5 17 10.1
    n=1.04 0 8.1 6.1
    n=1.06 8.4 9 6.6
    n=1.08 4.1 10.1 0
    n=1.10 7 9.2 4.5
    下载: 导出CSV
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  • 收稿日期:2022-07-23
  • 修回日期:2022-09-06
  • 网络出版日期:2022-10-28

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