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Different mirror geometries in two-dimensional photonic crystal slabs arestudied with fully-vectorial calculations. We compare their optical propertiesand, in particular, we show that, for heterostructure mirrors, the penetrationlength associated with the delay induced by distributed reflection is notcorrelated to the characteristic damping length of the electromagnetic energydistribution in the mirror. This unexpected result evidences that the usualtrade-off between short damping lengths and large penetration lengths that isclassically encountered in distributed Bragg reflectors can be overcome withcarefully designed photonic crystal structures.

Difference between penetration and damping lengths in photonic crystal mirrors