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首页> 外文期刊>Physica, B. Condensed Matter >Fano resonances of a ring-shaped 'hexamer' cluster at near-infrared wavelength
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Fano resonances of a ring-shaped 'hexamer' cluster at near-infrared wavelength

机译：近红外波长的环形“六聚醚”簇的扇形共振

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Fano resonances have been studied intensely in the last decade, since it is an important way to decrease the resonance line width and enhance local electric field. However, achieving a Fano line-shape with both narrow line width and high spectral contrast ratio is still a challenge. In this paper, we theoretically predict the Fano resonance induced by the extinction of normal plane wave in a ring-shaped hexamer cluster at near-infrared wavelength. In order to obtain the narrow Fano line width and high spectral contrast ratio, the relationships between the Fano line-shape and the parameters of the nanostructure are analyzed in detail. The nanostructure is simulated by using commercial software based on finite element method. The simulation results show that when the structural parameters are optimized, the Fano line width can be narrowed down 0.028 eV with a contrast ratio of 86%, and the local electric field enhancement factor at the Fano resonance wavelength can reach to 36. Furthermore, the effective mode volume of the structure is 3: 9 x 10(-23) m(3) which is lower than the available literature. These results indicate many potential applications of the Fano resonance in multiwavelength surface-enhanced Raman scattering and biosensing.
机译：过去十年来研究了Fano共振，因为它是减少谐振线宽和增强局部电场的重要途径。然而，实现具有窄线宽和高光谱对比度的扇形线形状仍然是一个挑战。在本文中，我们理论上预测近红外波长在环形六聚体簇中的正常平面波的灭火引起的扇形共振。为了获得窄的Fano线宽和高光谱对比度，详细地分析了Fano线形和纳米结构参数之间的关系。通过基于有限元方法使用商业软件来模拟纳米结构。仿真结果表明，当结构参数优化时，扇形线宽可以缩小0.028eV，对比度为86％，扇形谐振波长的局部电场增强因子可以达到36.此外，结构的有效模式体积为3：9×10（-23）m（3），其低于可用文献。这些结果表明了扇形谐振在多波长表面增强拉曼散射和生物传感中的许多潜在应用。

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