Abstract
A concave two-dimensional (2D) photonic crystal waveguide (PCW) with
corrugated surface is theoretically used as a focusing structure. To design this
structure, a genetic algorithm is combined with the finite-difference time-domain
method. For PCWs with different degrees of concaveness, the power reaches about 80%
at different focusing points when the morphology of the concave surface is
optimized. More importantly, the focusing location is easily controlled by changing
the location of the detector placed in the output field.
© 2011 Chinese Optics Letters
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