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The slab-thickness dependence of the photonic bandgap in air-bridge photonic-crystal slabs was theoretically investigated by the 3-D plane-wave expansion method. The photonic bandgap was found to achieve a maximum for a certain slab thickness depending on air-hole volume filling factor. A kink in the photonic bandgap width versus slab thicknesses was observed, and found to be due to a transition in...
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