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Improving sensitivity by multi-coherence of magnetic surface plasmons

YANG Zong-meng XING Qian CHEN Yi-an HOU Yu-min

杨宗蒙, 邢前, 陈怡安, 侯玉敏. 通过磁表面等离激元的多重相干提高灵敏度[J]. 中国光学(中英文), 2023, 16(2): 458-465. doi: 10.37188/CO.EN.2022-0009
引用本文: 杨宗蒙, 邢前, 陈怡安, 侯玉敏. 通过磁表面等离激元的多重相干提高灵敏度[J]. 中国光学(中英文), 2023, 16(2): 458-465. doi: 10.37188/CO.EN.2022-0009
YANG Zong-meng, XING Qian, CHEN Yi-an, HOU Yu-min. Improving sensitivity by multi-coherence of magnetic surface plasmons[J]. Chinese Optics, 2023, 16(2): 458-465. doi: 10.37188/CO.EN.2022-0009
Citation: YANG Zong-meng, XING Qian, CHEN Yi-an, HOU Yu-min. Improving sensitivity by multi-coherence of magnetic surface plasmons[J]. Chinese Optics, 2023, 16(2): 458-465. doi: 10.37188/CO.EN.2022-0009

通过磁表面等离激元的多重相干提高灵敏度

详细信息
  • 中图分类号: O482.31

Improving sensitivity by multi-coherence of magnetic surface plasmons

doi: 10.37188/CO.EN.2022-0009
Funds: Supported by National Natural Science Foundation of China (No. 61575006)
More Information
    Author Bio:

    Yang Zong-meng (1996—), male, born in Daqing, Heilongjiang province, is now a master candidate in the School of physics, Beijing University, maily engaged in the research of coherence of surface plasmons. E-mail: zemelyang@pku.edu.cn

    Hou Yu-min, female, born in Weifang, Shandong Province, Ph.D, now is a asocciate professor in the School of physics, Beijing University, mainly engaged in the research of surface plasmons recently. E-mail: ymhou@pku.edu.cn

    Corresponding author: ymhou@pku.edu.cn
  • 摘要:

    本文研究了一维金属纳米狭缝阵列中磁表面等离激元的相干现象,并提出了一种双谷传感方法以提高灵敏度。与通常所采用的固定入射角度进行波长扫描的方式不同,本文采用固定波长改变入射角度的方式研究表面等离激元的相干现象。由于延迟效应的存在,随着周围介质折射率的变化,两个谷会向相反的方向移动。相比于使用单一谷进行标定的方式,两个相反方向移动的谷可以有效提高灵敏度。用于标定的两个谷单独的灵敏度最大分别为39.2°/RIU和102.4°/RIU,而双谷标定的总灵敏度可达141.6°/RIU。此外,狭缝介质与上层介质的折射率不一致对传感性能的影响很小,故其有广泛的应用前景。

     

  • Figure 1.  (a) Schematic diagram of one-dimensional metallic nano-slit arrays structure on sapphire substrate. The whole structure is immersed in water; (b) the reflection spectrum at normal incidence; (c)(d) the normalized magnetic field intensity distributions corresponding to the dip 1 and dip 2, respectively

    Figure 2.  Analysis of the phase difference between neighboring magnetic surface plasmon resonances in one-dimensional metallic nano-slit arrays in (a) water and (b) substrate. The red arrows represent the incident light

    Figure 3.  2D Reflection spectra of the structure in the range of $\theta = 0 \sim 60^\circ $ and $\lambda = 1\;000 \sim 1\;700\;{\rm{nm}}$. (a) Three dashed lines $C_{m = - 1}^{{\rm{water}}}$, $C_{m = 1}^{{\rm{water}}}$, and $C_{m = - 2}^{{\rm{water}}}$ represent different orders of magnetic surface plasmon coherence corresponding to the interface between metal and water, respectively. Two solid lines $C_{l = - 2}^{{\rm{sub}}}$ and $C_{l = 1}^{{\rm{sub}}}$ represent different orders of coherence corresponding to the interface between metal and substrate; (b) positions of fixed wavelength $\lambda = 1150\;{\rm{nm}}$ and fixed incident angle $\theta = 5^\circ $ are marked by vertical and horizontal dashed lines in 2D spectrum, respectively

    Figure 4.  (a) Angle-resolved reflection spectrum at a fixed incident wavelength of 1150 nm. (b) The four graphs show the normalized magnetic field intensity distributions corresponding to the four dips A, B, C and D appearing in (a), respectively. Black arrows represent the Poynting vectors

    Figure 5.  (a) The angle-resolved reflectance spectrum obtained by changing the refractive index of the upper medium (nw=1.33 ~ 1.53) with an interval of 0.05 at the wavelength of 1150 nm. (b) Dip position varying with the refractive index. (c) Reflection spectrum is obtained by changing the wavelength when $\theta $ is fixed at 5°. As the refractive index increases, both coherence dips are red-shifted. (d) The angle difference between dip A and dip B varying with the upper medium

    Figure 6.  Sensing performance comparison in two conditions. Condition 1: the refractive index of the medium in the slit is the same as that of the upper medium; condition 2: the refractive index of the medium in the slit is fixed at 1.33

    Table  1.   Sensitivities and FOMs with different refractive indices

    n1.331.381.431.481.53
    SA/(°)·RIU−139.237.434.833.232.4
    SB/(°)·RIU−1102.495.483.474.270
    S/(°)·RIU−1141.6132.8118.2107.4102.4
    FOMA/RIU−1115.2104.091.885.682.9
    FOMB/RIU−1214.1213.7185.9172.3167.3
    下载: 导出CSV

    Table  2.   Comparison of the proposed structure with previously reported devices

    StructureSensitivity/(°)RIU−1Reference
    Metallic nano-slit arrays141.6This work
    Graphene-MoS2-TiO2-SiO285.375[39]
    DBL-XMene-FG64[40]
    ZnO and bi-metallic (Ag-Au) layers116.67[41]
    Gate-controlled graphene sensor108[42]
    下载: 导出CSV
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  • 收稿日期:  2022-05-24
  • 修回日期:  2022-06-20
  • 网络出版日期:  2022-08-24

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