Controlling surface plasmon polaritons in transformed coordinates

TL;DR

This paper reviews the use of transformational plasmonics to control surface plasmon polaritons on complex surfaces, enabling advanced manipulation like cloaking and focusing with curved anisotropic metasurfaces.

Contribution

It introduces a method to design curved anisotropic metasurfaces for precise control of surface plasmon polaritons using transformational optics principles.

Findings

Designs for cylindrical and conical plasmonic carpets and cloaks.

Asymptotic expression for geometric potential in small curvature limit.

Enhanced control of surface waves on complex geometries.

Abstract

Transformational optics allow for a markedly enhanced control of the electromagnetic wave trajectories within metamaterials with interesting applications ranging from perfect lenses to invisibility cloaks, carpets, concentrators and rotators. Here, we present a review of curved anisotropic heterogeneous meta-surfaces designed using the tool of transformational plasmonics, in order to achieve a similar control for surface plasmon polaritons in cylindrical and conical carpets, as well as cylindrical cloaks, concentrators and rotators of a non-convex cross-section. Finally, we provide an asymptotic form of the geometric potential for surface plasmon polaritons on such surfaces in the limit of small curvature.