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Optimization of growth and ordering of Ag nanoparticle arrays on ripple patterned alumina surfaces for strong plasmonic coupling

机译:波纹图案化氧化铝表面上Ag纳米颗粒阵列的生长和有序性优化,以实现强等离子体耦合

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Low-energy ion beam sputtering of alumina thin films followed by growth of metallic nanoparticles by glancing angle deposition is optimized in order to produce arrays of silver nanoparticle chains with a strong plasmonic dichroism. A systematic study is undertaken in order to establish the influence of the angle of silver deposition and the ordering of the pre-patterned rippled surface on the morphology and organization of the nanoparticles, and on their associated optical properties. High ion fluence for ripple formation and low glancing angle for metal deposition favor the formation of aligned and elongated particles with sub-nanometer gaps. Numerical simulations show that these nanoparticle arrays generate high electric field enhancements for an excitation parallel to the particle chains, and therefore can be used for surface enhanced spectroscopies.
机译:对氧化铝薄膜的低能离子束溅射,然后通过掠射角沉积来生长金属纳米颗粒进行了优化,以产生具有强等离子体二色性的银纳米颗粒链阵列。为了确定银沉积角度和预图案化波纹表面的有序性对纳米颗粒的形态和组织及其相关光学性能的影响,进行了系统的研究。用于形成波纹的高离子通量和用于金属沉积的低掠射角有利于形成具有亚纳米间隙的对准且细长的颗粒。数值模拟表明,这些纳米粒子阵列为平行于粒子链的激发产生了高电场增强,因此可用于表面增强光谱学。

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