Abstract
One-dimensional traditional pure dielectric photonic crystals have disadvantages that the design of TE-polarization band-pass filters is difficult,and the bandgaps of TE-and TM-polarization band-pass filters are narrow.Based on the fact that a greater permittivity(permeability) than permeability(permittivity) makes wider TE(TM) bands than TM(TE) bands,three kinds of filters,(TE-polarization band-pass filter,TM-polarization band-pass filter and double-polarization band-pass filter),were designed by stop-band superposition of one-dimensional photonic crystals.Each of them was a heterostructure constructed by two sub-photonic-crystals,hence the structure provided a narrow-frequency pass-band and the bandgap was enlarged.Due to the combination of dielectric and magnetic materials,the proposed design has simple structures with wide bandgaps and narrow-frequency pass-bands.Besides,the effect of magnetic material dispersion on the performance of polarization filters was discussed using a kind of magnetic material which has been reported.
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