Enlargement of Zero Average Index Gaps Frequency Range of Multiple-Channeled Filters by the Use of Heterostructures Containing Negative-Index Materials

Bandgap properties of hybrid structures combining defects and multiple heterostructures containing negative-index materials are investigated by optical transfer matrix method. This photonic heterostructure consists of different one-dimensional photonic crystals. The results obtained show that the zero-averaged refractive-index gaps can be substantially extended when the constituent ID photonic crystals have to be properly chosen and the phenomenon of efficient multiple-channeled optical filtering with enlarged zero average index gaps frequency range can be realized by adjusting the number and size of the defects. One, two, and three channeled filters are considered in the structures.