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Slow light in photonic crystals

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Figure

Figure 1 Waveguides, photonic bands, and group index characteristics.  The normalized wave number means the  wave number in units of reciprocal lattice 2/a where a is the lattice constant
Figure 2 Schematic operation, bands and group  index of dispersion-free slow-light devices
Figure 3  PC coupled waveguide and its light  propagation characteristics.  a, SEM image of a  fabricated device on a SOI substrate
Figure 5 CROW consisting of cascaded microrings  fabricated on a SOI substrate. Adapted with permission  from ref
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