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High spectral field enhancement and tunability in core-double shell metal-dielectric-metal spherical nanoparticles

机译：核-双壳金属-介电金属球形纳米粒子的高光谱场增强和可调谐性

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In this work we have developed full Mie theory for spherical core-double shell NPs, considering the boundary conditions of the electric and magnetic fields at each interface, to study plasmon resonances, optical extinction and spectral field enhancement of a generalized metal-dielectric-metal NPs. Keeping gold as the outer metal shell, calculations were carried out for different core metals (gold, silver, copper and aluminium) and different intermetallic dielectrics (silica, titanium dioxide, aluminium oxide and water). The metal dielectric function includes free and bound electron size corrections. Theoretical results show that the structures Al-SiO2-Au, Ag-SiO2-Au and Cu-SiO2-Au have field enhancement maxima factors of 33, 30 and 20 respectively in the outer region, all larger than that for Au-SiO2-Au (18). For the intermetallic region, field enhancement factors between 459, 960 and 841 are obtained for the first three structures mentioned before, respectively, also larger than that for Au-SiO2-Au (770). Spatial field enhancement was also calculated for both regions, for different core metals and fixed core-double shell size. A hybridization model specially developed for a core-double shell system allows an insightful interpretation of its plasmon resonances, field enhancement maxima and lack of symmetry in the outer region field distribution.
机译：在这项工作中，我们考虑了每个界面处的电场和磁场的边界条件，针对球形核-双壳NPs开发了完整的Mie理论，以研究广义金属-介电-金属的等离子体激元共振，消光和光谱场增强NP。以金作为金属外壳，对不同的芯金属（金，银，铜和铝）和不同的金属间电介质（二氧化硅，二氧化钛，氧化铝和水）进行了计算。金属介电功能包括自由和束缚电子尺寸校正。理论结果表明，Al-SiO2-Au，Ag-SiO2-Au和Cu-SiO2-Au结构在外部区域的场增强最大值分别为33、30和20，均大于Au-SiO2-Au。 （18）。对于金属间区域，前面提到的前三个结构的场增强因子分别在459、960和841之间，也大于Au-SiO2-Au（770）的场增强因子。对于不同的芯金属和固定的双核壳尺寸，还计算了两个区域的空间场增强。专门为核-双壳系统开发的杂交模型允许对其等离子体激元共振，场增强最大值和外部区域场分布缺乏对称性的深刻见解。

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