title: Slow light from sharp dispersion by exciting dark photonic angular momentum states.
abstract: A photonic angular momentum state (PAMS) with a topological charge of m≠±1 is dipole forbidden at all polarizations of free-space incidence due to the existence of a unique helical phase. We show that by indirectly exciting dark PAMSs through coupling with a bright resonant element, a sharply variant transmission behavior and strong dispersion can be achieved. This behavior can subsequently be utilized in slow light. A metamaterial design, in which a group index n(g) greater than 500 can be achieved, is present.
authors: MOE Key Laboratory of Weak-Light Nonlinear Photonics, School of Physics, Nankai University, Tianjin, China.
authors: Qing-Hua
authors: QH
authors: Guo
authors: Ming
authors: M
authors: Kang
authors: Teng-Fei
authors: TF
authors: Li
authors: Hai-Xu
authors: HX
authors: Cui
authors: Jing
authors: J
authors: Chen