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首页> 外文期刊>Applied Surface Science >Optimization of electric field enhancement of Ag@SiO_2 trimer nanospheres by finite difference time domain method
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Optimization of electric field enhancement of Ag@SiO_2 trimer nanospheres by finite difference time domain method

机译：时域有限差分法优化Ag @ SiO_2三聚体纳米球的电场增强

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摘要

Plasmonic properties of trimer nanocluster depend on their geometric configuration. In this work, local electric field enhancement in the junction region of the trimer Ag@SiO2 core-shell is investigated using three-dimensional electromagnetic simulation based on finite-difference time domain (FDTD) method. Plasmonic wavelength dependence for the two orthogonal polarizations is analyzed for different geometric configurations by gradually breaking the symmetry of the trimer nanospheres. The highly symmetric trimer in the form of equilateral triangle pattern possesses highly intense hotspots with the resonance wavelengths that are degenerate in nature. Breaking of this mode degeneracy occurs when the symmetric triangular pattern of the trimer is gradually transformed to a linear chain arrangement. Trimer core shell with linear chain symmetry exhibits the highest electromagnetic field enhancement which is nearly four times greater than the bare metal trimer but is very sensitive to polarization direction. The localized surface plasmon resonance (LSPR) is red shifted and blue shifted under longitudinal and transverse polarization, respectively. The LSPR shift and the electric field enhancement of the trimer nanocluster upon symmetry breaking under different polarization is compared and is explained using plasmon hybridization theory. The large polarization insensitive electric field enhancement exhibited by the symmetry core-shell may be employed for surface enhanced Raman spectroscopy based chemical and biological molecule detection.
机译：三聚体纳米簇的等离子特性取决于其几何构型。在这项工作中，使用基于有限差分时域（FDTD）方法的三维电磁模拟，研究了三聚体Ag @ SiO2核-壳交界处的局部电场增强。通过逐渐破坏三聚体纳米球的对称性，分析了两种正交极化的等离激元波长依赖性。等边三角形图案形式的高度对称三聚体具有高强度热点，其共振波长本质上是简并的。当三聚体的对称三角形图案逐渐转变为线性链排列时，会发生这种模式简并性的破坏。具有线性链对称性的三聚体核壳表现出最高的电磁场增强效果，几乎是裸金属三聚体的四倍，但对极化方向非常敏感。局部表面等离振子共振（LSPR）在纵向和横向极化下分别发生红移和蓝移。比较了三极化纳米团簇在不同极化条件下对称断裂时的LSPR位移和电场增强，并利用等离激元杂交理论对其进行了解释。对称核-壳表现出的大极化不敏感电场增强可用于基于表面增强拉曼光谱的化学和生物分子检测。

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