J. Eur. Opt. Society-Rapid Publ. 21, 28( 2025) 301
Figure
3. Dependence of effective mode index on plasma frequency and cyclotron frequency at s = 50 ps, t = 100 nm, x c = 3 10 11 Hz and x p = 2 THz.
Figure 4. Dependence of propagation length on plasma frequency and cyclotron frequency s = 50 ps, t = 100 nm and l = 0.2 eV.
frequency. As the cyclotron frequency increases, the effective mode index decreases, but the dispersion curves start shifting toward the high-propagation-frequency region. When the cyclotron frequency increases, the phase velocity of the EM wave increases due to the influence of the magnetic field. The plasma permittivity tensor components change due to this effect. An increase in the phase velocity leads to a decrease in the effective mode index. It is concluded that using the plasma frequency and cyclotron frequency of the magnetized plasma medium for the proposed waveguide structure can enable the plasmonic community to investigate new phenomena, develop advanced materials, and design innovative devices.
To better understand the SPP properties for the proposed waveguide structure, the propagation length and phase velocity are shown in Figures 4 and 5, respectively. Figure 4a depicts the dependence of the propagation length on the plasma frequency in the THz-propagation-frequency region. The propagation frequency increases with the plasma frequency. It is worth noting that in contrast to
Figure 2a, the slope of variation decreases with the plasma frequency. Furthermore, a higher cutoff frequency is achieved at the highest plasma frequency( i. e., x p = 4THz). Figure 4b plots the variation in propagation length with cyclotron frequency. The cutoff frequency increases with the cyclotron frequency. Furthermore, increasing the cyclotron frequency causes the propagation frequency band to narrow. Figures 5a and 5b illustrate the variation in phase velocity under varying chemical potentials and plasma frequencies. Figure 5a clearly shows that the propagation frequency and bandgap decrease when the chemical potential is increased. Moreover, at higher propagation frequencies, the dispersion curves demonstrate non-significant behaviors, which is of no practical significance in the field of plasmonics. Figure 5b illustrates the dependence of the phase velocity on the propagation frequency for different plasma frequencies. It is evident that the propagation frequency and phase velocity can be varied by substantially varying the plasma frequency of the magnetized plasma medium.