Efficient and wavelength-dependent directional launching of a nondiffracting surface plasmon polariton beam device
Efficient and wavelength-dependent directional launching of a nondiffracting surface plasmon polariton beam device
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非衍射表面等离子体激元光束装置的高效且与波长相关的定向发射
DOI：
10.1364/ome.435497
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发表时间：
2021-10
影响因子：
2.8
通讯作者：
Lin Jingquan
中科院分区：
文献类型：
--
作者：
Hu Hanmin;Qin Yulu;Ji Boyu;Lang Peng;Song Xiaowei;Lin Jingquan
无衍射表面等离子体激元(SPP)光束的高效激发和动态操控是实现新一代片上器件、近场光学俘获和微操作等实际应用的重要前提。在这里，我们提出了两种高效耦合和波长相关的无衍射SPP光束单向器件，分别可以产生和操纵贝塞尔类SPP光束和SPP瓶形光束。不同于传统的槽或脊结构将SPP功率从边界平均分配到两侧，紧凑耦合元件将匹配波长的所有SPP功率定向到一侧，从而产生更高的收集效率。此外，当改变入射光的波长时，产生的贝塞尔类SPP光束或SPP瓶形光束可以在器件的一侧定向激发。该器件的设计为构建非衍射SPP光束的波长相关动态操纵等离子体器件提供了一种新的手段，并在片上互连电路和近场光陷获中具有潜在的应用前景。
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.
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