A novel tunable filter featuring defect mode of the TE wave from one-dimensional photonic crystals doped by magnetized plasma

A novel tunable filter featuring the defect mode of the TE wave from one-dimensional photonic crystals doped by magnetized plasma is presented. The photonic crystals are composed by SiO2 and air with one defect layer made by magnetized plasma. By the transfer matrix method and Bloch’s theorem, we find out that the frequency of the defect mode can be modulated by plasma density or external magnetic field. Without changing the structure of the photonic crystal, the defect mode can be modulated in a larger frequency range, especially when the left-hand polarized electromagnetic wave is utilized.