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Polarization-controlled unidirectional excitation of surface plasmon polaritons utilizing catenary apertures

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Abstract

Controlling the propagation direction of surface plasmon polaritons (SPPs) at will using planar structures has been investigated in recent years. However the realization of a high extinction ratio of a SPP directional launcher in a densely integrated and miniaturized way, especially at the wavelength scale, still remains a challenge. To the best of our knowledge, the maximum value of the extinction ratio of a unidirectional SPP launcher based on the planar metasurface in experiment is nearly 250, which relies on the combined effect of several gap-plasmon resonator blocks with a lateral dimension much larger than the incident wavelength. Here, we design and experimentally demonstrate a polarization-controlled unidirectional SPP launcher based on a single column catenary aperture array with a lateral dimension as small as 552 nm, which is even smaller than the working wavelength. Under the illumination of circularly polarized light, our designed SPP launcher exhibits a simulated extinction ratio reaching up to 495 at a wavelength of 618 nm and 283 in the experiment. The compact size and distinctive extinction ratio may pave a new way for the directional excitation of SPPs and can be useful in compact plasmonic circuits and other photonic integrated devices.

Graphical abstract: Polarization-controlled unidirectional excitation of surface plasmon polaritons utilizing catenary apertures

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Publication details

The article was received on 20 Nov 2018, accepted on 24 Jan 2019 and first published on 25 Jan 2019


Article type: Paper
DOI: 10.1039/C8NR09383K
Citation: Nanoscale, 2019, Advance Article

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    Polarization-controlled unidirectional excitation of surface plasmon polaritons utilizing catenary apertures

    J. Jin, X. Li, Y. Guo, M. Pu, P. Gao, X. Ma and X. Luo, Nanoscale, 2019, Advance Article , DOI: 10.1039/C8NR09383K

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