Fano resonance properties of the arrays of metallic half-ring/rectangle structure
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摘要: 本文设计了金属半圆环/长板阵列,并应用有限元方法研究了该阵列的透射特性。研究表明:由于半圆环与长板之间的电场耦合,在该阵列中产生了法诺共振现象。法诺共振峰强烈地依赖于半圆环/长板的结构参数和相对位置,并且法诺共振峰对周围介质折射率有着较高的灵敏度,最高可以达到862.5 nm/RIU。这些结果有助于设计基于法诺共振的微纳光子学器件。Abstract: In this paper, arrays of metallic half-ring/rectangle were designed, and their transmission properties were investigated by the finite element method. Fano resonances appeare in the transmission spectra due to the electric field couplings between the half-ring and rectangle. Fano resonant peaks are dependent strongly on the structural parameters and the relative position of the half-ring and rectangle. They are also sensitive to refraction index around the arrays of metallic half-ring/rectangle and the highest sensitivity can be achieved to 862.5 nm/RIU. These results would be helpful for designing the micro-nano photonic devices based on the Fano resonance.
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图 2 (a、b)入射光沿y方向偏振时，半圆环和半圆环/长板阵列的透射光谱图及其透射峰处的电荷分布；(c)入射光沿x方向偏振时，长板阵列的透射光谱图及其透射峰处的电荷分布
Figure 2. (a，b)Transmission spectra and the distribution of charges in the resonant peaks of the arrays of half-ring and half-ring/rectangle with the electric field polarized along y; (c)Transmission spectrum and the distribution of charges in the resonant peaks of the rectangle arrays with the electric field polarized along x
图 3 入射光沿y方向偏振时，半圆环/长板阵列的不同的中心偏移量d对应的透射光谱
Figure 3. Transmission spectra of the different center offset d of half-ring/rectangle arrays with the electric field polarized along y
图 4 入射光沿y方向偏振时，半圆环/长板阵列的不同结构参数所对应的透射光谱
Figure 4. Transmission spectra of the different structural parameters of half-ring/rectangle arrays with the electric field polarized along y
图 5 入射光沿y方向偏振时，半圆环/长板阵列的周围填充不同折射率n所对应的透射光谱
Figure 5. Transmission spectra of the different refraction index n of half-ring/rectangle arrays with the electric field polarized along y
图 6 入射光沿x方向偏振时，半圆环/长板和半圆环阵列的透射光谱图及其透射峰处的电荷分布
Figure 6. Transmission spectra and the distribution of charges in the resonant peaks of the arrays of half-ring and half-ring/rectangle with the electric field polarized along x
图 7 入射光沿x方向偏振时，半圆环/长板阵列的不同的中心偏移量d所对应的透射光谱
Figure 7. Transmission spectra of the different center offset d of half-ring/rectangle arrays with the electric field polarized along x
图 8 入射光沿x方向偏振时，半圆环/长板阵列的不同结构参数所对应透射光谱
Figure 8. Transmission spectra of the different structural parameters of half-ring/rectangle arrays with the electric field polarized along x
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