title: Compact spoof surface plasmon polaritons waveguide drilled with L-shaped grooves.
abstract: It has been recently demonstrated that a metallic surface with periodic grooves can support a laterally-confined surface wave called spoof plasmon polaritons (SSPPs). Here we propose a SSPPs waveguide drilled with L-shaped grooves which can support SSPPs efficiently. Dispersion relations based on the modal expansion method (MEM) are derived and discussed. Under the deep subwavelength condition, a concise formula for the dispersion relations is obtained. Our results show that the dispersion relations are sensitive to the transversal depths. The L-shaped groove is equivalent to a deeper rectangular groove, but more compact than the straight one. As an example of the applications, the rainbow-trapping effect is realized by changing the transversal depths of the L-shaped grooves.
authors.forename: Lili
authors.initials: L
authors.lastname: Tian
authors.forename: Zhenhui
authors.initials: Z
authors.lastname: Zhang
authors.forename: Jianlong
authors.initials: J
authors.lastname: Liu
authors.forename: Keya
authors.initials: K
authors.lastname: Zhou
authors.forename: Yang
authors.initials: Y
authors.lastname: Gao
authors.forename: Shutian
authors.initials: S
authors.lastname: Liu