Abstract

We analytically propose radially oscillating and quasi-guided surface plasmon polaritons (SPPs) by designing the outer and core dielectric permittivities εa and εc of a cylindrical metallic nanotube. When the propagation constant satisfies εa<Re(kz/k0)<εc, the electromagnetic field propagates along the radial direction in the core region and decays outside the nanotube, forming a standing radially oscillating SPP. In contrast, when εc<Re(kz/k0)<εa, the electromagnetic field decays in the core region and propagates outside the nanotube, forming a quasi-guided SPP. The propagation length of both SPPs can reach tens of micrometers, in particular, the radially oscillating SPPs have an ultrastrong light confinement. Finally, we design position-flexible broadband plasmonic router based on quasi-guided SPPs, and we also discuss the advantages of a nanolaser based on radially oscillating SPPs.

© 2014 Optical Society of America

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