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Compact and efficient injection of light into band-edge slow-modes

Philippe Velha 1 Jean-Paul Hugonin 1 Philippe Lalanne 1
1 Laboratoire Charles Fabry de l'Institut d'Optique / Naphel
LCFIO - Laboratoire Charles Fabry de l'Institut d'Optique
Abstract : We design compact (a few wavelength long) and efficient (>99%) injectors for coupling light into slow Bloch modes of periodic thin film stacks and of periodic slab waveguides. The study includes the derivation of closed-form expressions for the injection efficiency as a function of the group-velocity of injected light, and the proof that 100% coupling efficiencies for arbitrary small group velocities is possible with an injector length scaling as log(c/vg). The trade-off between the injector bandwidth and the group velocity of the injected light is also considered.
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Philippe Velha, Jean-Paul Hugonin, Philippe Lalanne. Compact and efficient injection of light into band-edge slow-modes. Optics Express, Optical Society of America, 2007, 15 (10), pp.6102-6112. ⟨hal-00846685⟩

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