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Tunable Multi-Port Surface Plasmon Polariton Excitation with Nanostructures

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Abstract

Surface plasmon polaritons (SPPs) have appealing features such as tighter spatial confinement and higher local field intensity. Manipulation of surface plasmon polaritons on metal/dielectric interface is an important aspect in the achievement of integrated plasmonic circuit beyond the diffraction limit. Here, we introduce a design of pin cushion structure and a holographic groove pattern structure for tunable multi-port SPPs excitation and focusing. Free space light is coupled into SPPs through momentum matching conditions. Both nanostructures are capable of tunably controlling of SPPs depending on the incident polarizations, while the holographic method provides more flexibility of wavelength-dependent excitations. Furthermore, a quantitative method is applied to calculate the efficiencies of excitation for both nanostructures under different conditions, including radially polarized incident beams. These results can work as a guidance and be helpful to further choice of the suitable design strategies for variable plasmonic applications such as beam splitter, on-chip spectroscopy, and plasmonic detectors.

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Acknowledgments

We acknowledge the support by the National Natural Science Foundation of China (Projects No. 61505007). L.H. acknowledges the Excellent Young Scholars Research Fund of Beijing Institute of Technology.

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Authors and Affiliations

  1. School of Optoelectronics, Beijing Institute of Technology, Beijing, 100081, China

    Xu Song, Lingling Huang & Yongtian Wang

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  1. Xu Song
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  2. Lingling Huang
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  3. Yongtian Wang
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Correspondence to Lingling Huang.

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Song, X., Huang, L. & Wang, Y. Tunable Multi-Port Surface Plasmon Polariton Excitation with Nanostructures. Plasmonics 11, 817–823 (2016). https://doi.org/10.1007/s11468-015-0114-0

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  • DOI: https://doi.org/10.1007/s11468-015-0114-0

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