The high-efficiency excitation and dynamic manipulation of the nondiffracting surface plasmon polariton (SPP) beam are important prerequisites for practical applications including the next-generation on-chip devices, near field optical trapping, and micromanipulation. Here we proposed two kinds of high-efficiency coupling and wavelength-dependent nondiffracting SPP beam unidirectional devices, which can generate and manipulate Bessel-like SPP beam or SPP Bottle beam, respectively. Different from the conventional groove or ridge structure that equally split SPP power to propagate from the boundary to both sides, the compact coupling element directs all of the SPP power of the matched wavelength to one side, resulting in higher collecting efficiency. Besides, as the wavelength of the incident light is changed, the generated Bessel-like SPP beam or SPP Bottle beam can be directionally excited on one side of the device. The design of the proposed devices provides a new means for constructing plasmonic devices with wavelength-dependent dynamic manipulation of nondiffracting SPP beams and has potential applications in on-chip interconnect circuits and near-field optical trapping.

中文翻译：

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非衍射表面等离子体激元偏振束装置的高效且依赖于波长的定向发射

非衍射表面等离子体激元 (SPP) 光束的高效激发和动态操纵是实际应用的重要先决条件，包括下一代片上器件、近场光捕获和显微操作。在这里，我们提出了两种高效耦合和波长相关的非衍射 SPP 光束单向器件，它们可以分别产生和操纵类贝塞尔 SPP 光束或 SPP Bottle 光束。与传统的槽或脊结构将 SPP 功率等分从边界传播到两侧不同，紧凑的耦合元件将匹配波长的所有 SPP 功率导向一侧，从而产生更高的收集效率。此外，随着入射光波长的变化，生成的类贝塞尔 SPP 光束或 SPP Bottle 光束可以在设备的一侧定向激发。所提出的器件的设计为构建具有波长相关动态操纵非衍射 SPP 光束的等离子体器件提供了一种新方法，并且在片上互连电路和近场光捕获中具有潜在的应用。