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arXiv 1209.2625cond-mat.mes-hallphysics.optics
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金薄膜上金纳米粒子阵列的等离子体模

Plasmonic modes of gold nano-particle arrays on thin gold films

Andreas Hohenau, Joachim R. Krenn

摘要:

在金属薄膜上的金属纳米颗粒的规则阵列具有可调谐的光学共振,可以应用于表面增强拉曼散射或生物传感。为了开发更多的表面选择性几何形状,我们研究了25 nm厚的金膜上的规则金纳米颗粒阵列,与传统的表面等离子体共振设置中使用的对称模式相比,它可以激发具有更好的场限制的非对称表面等离子体模式。通过光学消光光谱,我们确定了我们的结构所维持的等离子体模式。此外,热处理的金属结构的作用进行了研究,揭示了在光学性能上的金的晶体结构的修改的作用。

英文摘要:

Regular arrays of metal nanoparticles on metal films have tuneable optical resonances that can be applied for surface enhanced Raman scattering or biosensing. With the aim of developing more surface selective geometries we investigate regular gold nanoparticle arrays on 25nm thick gold films, which allow to excite asymmetric surface plasmon modes featuring a much better field confinement compared to the symmetric modes used in conventional surface plasmon resonance setups. By optical extinction spectroscopy we identify the plasmonic modes sustained by our structures. Furthermore, the role of thermal treatment of the metal structures is investigated, revealing the role of modifications in the crystalline structure of gold on the optical properties.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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