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In this work we show theoretically that it is possible to design a large bandgap in the infrared range using a one-dimensional Photonic Crystalheterostructure made of porous silicon. Stacking together multiple photoniccrystal substructures of the same contrast index, but of different latticeperiods, it is possible to broad the narrow forbidden band gap that can bereached by the low contrast index of the porous silicon multilayers. The mainidea in this work is that we can construct a Giant Photonic Band Gap -as largeas desired- by combining a tandem of photonic crystals substructures by using asimple analytical rule to determine the period of each substructure.

Large Frequency Range of Photonic Band Gaps on Porous Silicon Heterostructures for Infrared Applications