Directionally-controlled periodic collimated beams of surface plasmon polaritons on metal film in Ag nanowire/Al2O3/Ag film composite structure.
Directionally-controlled periodic collimated beams of surface plasmon polaritons on metal film in Ag nanowire/Al2O3/Ag film composite structure.
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DOI：
10.1021/nl504018q
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发表时间：
2015-01
期刊：
影响因子：
10.8
通讯作者：
Hong Wei;Xiaorui Tian;D. Pan;Li Chen;Zhili Jia;Hongxing Xu
中科院分区：
文献类型：
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作者：
Hong Wei;Xiaorui Tian;D. Pan;Li Chen;Zhili Jia;Hongxing Xu
等离子体激元有望实现微型光子器件和电路，其中可以使用表面等离子体激元（SPP）（金属/电介质界面处电子集体振荡的表面波）在纳米尺度上限制和控制光。然而，实现等离子体应用从根本上需要在不同等离子体结构中引导和转移SPP的能力。在这里，周期性准直SPP光束的产生和控制的复合结构中的银纳米线的银膜与它们之间的介电间隔层的报告。结果表明，银薄膜上的准直光束来源于纳米线上两个SPP模产生的薄膜-SPP之间的干涉。准直光束的方向可以很容易地通过改变介电间隔物的厚度来调谐。这些发现表明纳米线SPP转移到薄膜SPP，并提供了一种新的方法来产生无衍射SPP光束，这可以促进复杂的等离子体系统的设计和开发的设备应用，并使定制的SPP辐射和SPP物质的相互作用。
Plasmonics holds promise for the realization of miniaturized photonic devices and circuits in which light can be confined and controlled at the nanoscale using surface plasmon polaritons (SPPs), surface waves of collective oscillations of electrons at a metal/dielectric interface. However, realizing plasmonic applications fundamentally requires the ability to guide and transfer SPPs in different plasmonic structures. Here the generation and control of periodic collimated SPP-beams are reported in composite structures of silver nanowire on silver film with a dielectric spacer layer between them. It is revealed that the collimated beams on the silver film originate from the interference between film-SPPs generated by two SPP modes on the nanowire. The direction of the collimated beams can be readily tuned by changing the thickness of the dielectric spacer. These findings demonstrate the transfer of nanowire SPPs to film SPPs and offer a new approach to generate nondiffracting SPP-beams, which could facilitate the design and development of complex plasmonic systems for device applications and enable the tailoring of SPP radiation and SPP-matter interactions.