Tunable plasmonic focus array generated by Dammann grating in tightly focusing system

Tunable plasmonic focus array generated by Dammann grating in tightly focusing system
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紧聚焦系统中达曼光栅产生的可调谐等离子体聚焦阵列

DOI:
10.1088/2040-8986/aaf2cc
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发表时间:
2018-12
期刊:
影响因子:
2.1
通讯作者:
et al
et al
中科院分区:
物理与天体物理4区
文献类型:
--
作者:
Xiaoyu Weng;Luwei Wang;Wei Yan;et al

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表面等离子体激元(SPP)在等离子体成像、传感器、等离子体镊子等广泛的应用中发挥着至关重要的作用。然而,SPP的激发给动态操纵SPP场带来了巨大的挑战。在这里,我们提出了一种完全光学控制的方法,在紧密聚焦系统中使用达曼光栅(DG)操纵SPP场,而不是在金属薄膜上定制特殊结构。由于自由空间入射矢量光束和SPP之间的耦合,SPP的相位可以直接由入射矢量光束的相位控制,而入射矢量光束是由自由空间中的DG调制的。因此,通过调节DG的参数,可以在金属薄膜上灵活地创建数量、位置和拓扑电荷可调的等离子体焦点阵列,而每个等离子体焦点的光强分布仅取决于入射矢量光束的偏振状态。这项工作为利用波前技术操纵 SPP 场迈出了重要一步,并可能为扩展全息术用于动态 SPP 场控制开辟新途径。
Surface plasmon polaritons (SPPs) play crucial roles in a wide-range of applications, such as plasmonic imaging, sensors, plasmonic tweezers, etc. However, the excitation of SPPs gives rise to a big challenge to manipulate SPP fields in a dynamical way. Here, we propose a full optics-controlled method to manipulate SPP fields with Dammann grating (DG) in a tightly focusing system, rather than customizing a special structure on the metal film. Owing to the coupling between free-space incident vector beam and SPPs, the phase of SPPs can be controlled directly by that of the incident vector beam, which is modulated by the DG in free space. Thus, by adjusting the parameters of the DG, a plasmonic focus array with tunable number, position and topological charge can be created flexibly on the metal film, while the light intensity distribution of each plasmonic focus is only dependent on the polarized state of the incident vector beam. This work presents an important step for the manipulation of SPP fields with wavefront techniques and may open new avenues to extend holography for dynamical SPP field control.
DOI: 10.1021/acs.nanolett.6b00478
发表时间: 2016-05-01
期刊: NANO LETTERS
影响因子: 10.8
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