Backscattering-immune one-way surface magnetoplasmons at terahertz frequencies

Area of Science:

• Condensed matter physics
• Plasmonics
• Terahertz technology

Background:

• Surface magnetoplasmons (SMPs) are crucial for terahertz (THz) applications.
• Understanding their behavior in magnetized semiconductor structures is key for device development.

Purpose of the Study:

• To theoretically investigate the dispersion properties of SMPs in a specific multilayered structure.
• To analyze the influence of magnetic field intensity and dielectric layer on SMP propagation.

Main Methods:

• Theoretical analysis of a physical model involving a magnetized semiconductor, dielectric cladding, and metal slab.
• Detailed examination of SMP dispersion diagrams and propagation characteristics.

Main Results:

• SMPs exhibit three distinct dispersion diagrams based on magnetic field intensity.
• Complete one-way propagation is achievable within the semiconductor's band gap, with maximum bandwidth at specific magnetic fields.
• Dielectric layer modes can interfere with one-way propagation but can be mitigated by reducing layer thickness.
• The metal slab enhances propagation length and backscattering immunity for SMPs.

Conclusions:

• The proposed structure supports tunable one-way propagation of surface magnetoplasmons in the terahertz regime.
• Control over magnetic field and dielectric layer thickness allows for optimization of SMP properties.
• The inclusion of a metal slab offers significant advantages for practical applications of SMPs.