Fig. 2: Demonstration of the impact of perturbing obstacles and/or nonlocal effects on the one-way surface magnetoplasmons (SMPs) in three structures.
The magnetic-field distribution obtained from finite-element method (FEM) simulations of three different structures: a–c Si-InSb, d opaque material (OM)-InSb, and e InSb-InSb. The simulations were performed at different frequencies: a 0.68ωp (ωp is the plasma frequency), b 0.7ωp, c 0.8ωp, d 1.05ωp, and e 1.1ωp. The damping rate γ was set to 5 × 10−3ωp, and the nonlocal parameter β was set to 1.07 × 106 m/s. f Two-dimensional xy-plane magnetic-field distribution for each case shown (in 1D) in panels a–e, under nonlocal conditions (inside the blue rectangle). g Calculation of λeff of the SMPs in nonlocal cases by using FEM simulations. \({\lambda }_{{{{{{{{\rm{eff}}}}}}}}}^{-}\) and \({\lambda }_{{{{{{{{\rm{eff}}}}}}}}}^{+}\) are the effective wavelengths of backward and forward SMPs, respectively. neff ( = 2πc/(ωλeff), the effective index) and k ( = 2π/λeff, wavenumber) can be derived from λeff. γ = 0 and ω = 0.8ωp.
