Extrinsic magnetised plasma kolakoski quasicrystal

This manuscript explores the microwave transmission properties of multilayer structures that employ the Kolakoski sequence. The structures, composed of alternating layers of extrinsic magnetized plasma, are analysed under normal incidence conditions, with a focus on various parameters such as frequency, external magnetic field intensity, and electron density. At frequencies higher than the plasma frequency , consistent bandgaps are observed across different layer counts, indicating strong transmission characteristics. Conversely, at frequencies lower than the plasma frequency, the thickness of the bandgap fluctuates due to the inherent nature of the Kolakoski sequence, suggesting potential applications in multi-channel filtering. The study demonstrates the ability to adjust the significant bandgap above the plasma frequency through manipulation of the external magnetic field. By increasing the strength of the magnetic field, the bandgap undergoes a shift and narrows, highlighting the tunability of the transmission properties. On the other hand, increasing the number of layers widens the bandgap below the plasma frequency, resulting in the emergence of narrow transmission peaks. Moreover, the influence of electron density on the transmission spectra is examined, showing that higher electron density leads to wider bandgaps, although with minimal frequency shifts. The intricate interplay between structural parameters, external factors, and transmission characteristics provides valuable insights for optimizing multi-channel microwave reflectors and related devices.