A photonic angular momentum state (PAMS) with a topological charge of $m\ne \pm 1$ 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.

© 2013 Optical Society of America

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