重叠纳米孔洞中的可调等离子体激元分子
Tunable Plasmon Molecules in Overlapping Nanovoids
摘要：
已知耦合和形状定制的金属纳米颗粒表现出杂化等离子体共振。这封信讨论了由埋在金中并填充有二氧化硅的重叠纳米空隙二聚体形成的互补系统的光学性质。这是等离子体激元工程的另一种途径，其受益于消失的辐射损失。我们的分析表明，设计人工等离子体分子的基础上的空隙等离子体杂交，它允许通过改变空隙之间的重叠模式微调的可能性。所提出的结构可以应用于通过掩埋光学元件的信号处理和可调等离子体生物传感。
英文摘要：
Coupled and shape-tailored metallic nanoparticles are known to exhibit hybridized plasmon resonances. This Letter discuss the optical properties of a complementary system formed by overlapped nanovoid dimers buried in gold and filled with silica. This is an alternative route for plasmon engineering that benefits from vanishing radiation losses. Our analysis demonstrates the possibility of designing artificial plasmon molecules on the basis of void plasmon hybridization, which allows fine mode tuning by varying the overlap between voids. The proposed structures could find application to both signal processing through buried optical elements and tunable-plasmon biosensing.
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