Tunable broadband reflector and narrowband filter of a dielectric and magnetized cold plasma photonic crystal

The tunable broadband reflector and the narrowband filter of a periodic structure composed of dielectric and magnetized cold plasma materials have been studied. The optical properties are calculated theoretically using the well-known simple transfer matrix method (TMM). Dispersion relation and transmission spectra of the considered structure with right-hand polarization and left-hand polarization of the magnetized cold plasma materials are studied. The right-hand polarization and the left-hand polarization of the magnetized cold plasma are exhibited due to positive and negative values of the external magnetic field, respectively. The dispersion relation and transmission spectra of the considered periodic structure with the most valuable parameters, like external magnetic field, electron density, and effective collision frequency of the magnetized cold plasma, have been analyzed. The tunable narrow filter for right-hand polarization is obtained with a high value of the external magnetic field and a low value of the electron density. The broadband filter for the left-hand polarization is investigated with a low value of the external magnetic field and a high value of the electron density of the magnetized cold plasma. It is also noted that the impact of variation of effective collision frequency of the magnetized cold plasma is minute in both cases. These calculated results reveal an innovative idea for designing the tunable broadband reflector and narrowband filter.