The properties of a tunable terahertz filter based on a photonic crystal with a magnetized plasma defect layer

Tunable terahertz (THz) filtering properties of a single channel filter are investigated. The filter structure is based on a defective photonic crystal. The defect layer is assumed as a magnetized plasma medium. The photonic crystal has the structure of (Dielectric-Dielectric)(L) Plasma (Dielectric-Dielectric)(L), where L is the number of unit cells on both sides of the plasma layer. The tunability of the defect mode is studied for various magnetic fields, plasma densities, and thicknesses of the plasma layer. We found that as the applied magnetic field increases, the defect modes shift to a higher frequency. Moreover, the defect modes shift to a shorter frequency as the plasma density or the plasma layer thickness increases. This article provides the theoretical basis for designing a tunable filter or a sensor depending on the parameters used at the THz range. Published under an exclusive license by AIP Publishing.

Automated summary

This study investigates the tunable terahertz filtering properties of a single channel filter based on a defective photonic crystal. The defect layer is assumed to be a magnetized plasma medium. The study explores the tunability of the defect mode under different magnetic fields, plasma densities, and thicknesses of the plasma layer. The results show that the defect modes shift to higher frequencies with increasing magnetic field, and to lower frequencies with increasing plasma density or plasma layer thickness. This article provides a theoretical basis for designing tunable filters or sensors in the THz range.