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Lu Ma

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Proceedings Article | 19 November 2019 Paper

Limited propagation and nanofocusing of radially polarized light through hybrid plasmonic waveguide

Jin Bu, Kang Li, Sicheng Zhang, Lu Ma, Yi Zhou, Ji Xu

Proceedings Volume 11184, 111840G (2019) https://doi.org/10.1117/12.2536613

KEYWORDS: Plasmonic waveguides, Light wave propagation, Dielectrics, Plasmonics, Waveguides, Nanophotonics, Dielectric polarization, Surface plasmon polaritons, Metals, Cladding

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Hybrid plasmonic waveguides (HPWs) have become a hot topic in nanophotonic due to their excellent optical field constraints and low propagation loss. Based on the polarization dependence of surface plasmon polariton (SPP) excitation the symmetry of cylindrical vector beams, a cylindrical hybrid plasmonic waveguide (CHPW) realizing limited propagation and two tapered hybrid plasmonic waveguides (THPWs) achieving nanofocusing are presented. CHPW supports radial polarization mode and well compensate mode propagation loss by adjusting the structural parameters of the waveguide. Splendid mode limitation and long transmission distance with low loss can be achieved simultaneously. On the basis of CHPW, the structure is tapered to realize nanofocusing. And periodic grooves are constructed on the metallic surface of the tapered hybrid plasmonic waveguide (THPW) to meet the phase matching condition and maximize the coupling of light energy from inside to outside. Meanwhile, the low index layer of THPW is replaced with two different index layers, which is broadened to gather more energy efficiently and the energy is converged on the apex of the waveguide to form the ultrahigh field enhancement, which is another optional way to improve the performance of THPW. The results offer vital reference value for designing and manufacture related photonic devices.

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