Slow light from sharp dispersion by exciting dark photonic angular momentum states

ArticleinOptics Letters 38(3):250-2 · February 2013with14 Reads
Impact Factor: 3.29 · DOI: 10.1364/OL.38.000250 · Source: PubMed


    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<sub>g</sub> greater than 500 can be achieved, is present.