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The authors investigated the evanescent field above a photonic crystal waveguide. In such a waveguide, light is confined in the in-plane direction by a photonic bandgap, and in the out-of-plane direction by total internal reflection. The authors show that the evanescent decay of the field above the waveguide is non-trivial due to the Bloch nature of the mode. As a result complex intensity patterns...
We propose chirped photonic crystal waveguides, in which some structured parameters are smoothly changed along the waveguide. We experimentally observed light localization and theoretically expected a group delay for such waveguides.
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