In this work we report the local growth of ordered arrays of 3D core–shell chiral nanohelices based on plasmonic gallium metal. The structures can be engineered in a single step using focused ion beam induced deposition, where a Ga⁺ ion source is used to shape the metallic nanohelix core, while the dielectric precursor is dissociated to create dielectric shells. The solubility of gallium in the different investigated dielectric matrices controls the core–shell thickness ratio of the nanohelices. The chiral plasmonic behaviour of these gallium-based nanostructures is experimentally measured by circularly polarized light transmission through nanostructure arrays and compared with numerical simulations. Large chiroptical effects in the visible range are demonstrated due to the plasmonic effects arising from gallium nanoclusters in the core.

中文翻译：

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用于圆偏振处理的镓手性纳米成形

在这项工作中，我们报告了基于等离子体镓金属的 3D 核壳手性纳米螺旋有序阵列的局部生长。可以使用聚焦离子束诱导沉积在一个步骤中设计结构，其中 Ga ⁺离子源用于塑造金属纳米螺旋核，而电介质前体被解离以产生电介质壳。镓在不同介电基质中的溶解度控制着纳米螺旋的核壳厚度比。这些镓基纳米结构的手性等离子体行为是通过圆偏振光透射通过纳米结构阵列进行实验测量的，并与数值模拟进行比较。由于核心中镓纳米团簇产生的等离子体效应，可见光范围内的大手性光学效应得以证明。