Tunable one-dimensional photonic crystals based on magnetic fluids

One-dimensional tunable photonic crystals based on MnFe2O4 magnetic fluids are investigated theoretically. The band structures of the photonic crystals are calculated. Simulation results indicate that the mid frequencies of the first, second and third band gaps can be tuned by the external magnetic field. The widths of the first and second band gaps decrease with the external magnetic field strength gradually, but those of the third band gaps increase with the external magnetic field strength.