Simulation study of a high-order mode terahertz radiation source based on an orthogonal grating waveguide and...

Area of Science:

• Physics
• Electrical Engineering
• Materials Science

Background:

• Conventional backward wave oscillators (BWOs) struggle to generate high-power terahertz (THz) radiation above 1 THz due to miniaturized structural dimensions.
• Generating high-frequency THz waves necessitates overcoming fabrication challenges associated with small structures.

Purpose of the Study:

• To propose a novel orthogonal grating waveguide for high-order mode operation in THz Backward Wave Oscillators (BWOs).
• To investigate the generation of powerful THz radiation using multiple sheet electron beams and the proposed waveguide structure.

Main Methods:

• A novel orthogonal grating waveguide design was proposed for high-order mode operation.
• Particle-in-cell (PIC) simulations were employed to analyze the performance of the proposed BWO.
• The interaction between high-order mode THz waves and multiple sheet electron beams was simulated.

Main Results:

• The proposed high-order mode BWO demonstrated the capability to produce over 1.08 W of THz power.
• The device operated effectively within the frequency range of 1.18-1.30 THz.
• The orthogonal grating waveguide offered easier fabrication compared to double staggered grating waveguides.

Conclusions:

• The developed BWO design offers a promising approach for extending THz radiation generation to higher frequencies.
• This methodology provides a potential solution for developing compact and powerful THz sources with tunable bandwidth.
• The study highlights the effectiveness of combining high-order mode THz waves with multiple sheet electron beams for enhanced power output.