|
Abstract
|
This study proposes a two-dimensional plasma photonic crystal structure to design a tunable
optical filter by changing the plasma characteristics or applying an external magnetic field. The structure
is composed of two-dimensional arrays of dielectric rods with a radius of b which is defected by a row of
plasma rods with a radius of b/2 in the middle of the structure. The optical properties of the structure
are simulated using the finite-difference time-domain (FDTD) method. The results indicate that with the
rise in the electron density of the plasma rods and changes in the intensity and direction of the applied
magnetic field, which is externally controllable, the appeared defect mode in the photonic bandgap, for a
TE (Transverse Electric) polarized incident electromagnetic beam, can be easily modulated. This ability
suggests that the proposed structure is a good candidate for designing externally tunable optical filters
which have a lot of applications.
|