Hybrid plasmonic waveguides (HPWs) have become a hot topic in nanophotonic due to their excellent optical fieldconstraints and low propagation loss. Based on the polarization dependence of surface plasmon polariton (SPP) excitationthe symmetry of cylindrical vector beams, a cylindrical hybrid plasmonic waveguide (CHPW) realizing limitedpropagation and two tapered hybrid plasmonic waveguides (THPWs) achieving nanofocusing are presented. CHPWsupports radial polarization mode and well compensate mode propagation loss by adjusting the structural parameters ofthe 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 themetallic surface of the tapered hybrid plasmonic waveguide (THPW) to meet the phase matching condition and maximizethe coupling of light energy from inside to outside. Meanwhile, the low index layer of THPW is replaced with two differentindex layers, which is broadened to gather more energy efficiently and the energy is converged on the apex of thewaveguide 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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