Metallic and 3D-printed dielectric helical terahertz waveguides

Area of Science:

• Optics and Photonics
• Materials Science
• Electromagnetism

Background:

• Terahertz (THz) radiation requires specialized waveguides for efficient transmission.
• Metallic and dielectric waveguides are commonly used but have limitations in bandwidth and flexibility.
• Helical waveguide designs offer potential for improved THz wave guidance.

Purpose of the Study:

• To investigate the performance of metallic and 3D-printed dielectric helical waveguides for Terahertz radiation.
• To compare experimental results with simulation data for validation.
• To assess the suitability of these waveguides for practical Terahertz applications.

Main Methods:

• Terahertz time-domain spectroscopy (THz-TDS) for experimental measurements.
• Finite-difference time-domain (FDTD) simulations for theoretical analysis.
• Fabrication of metallic and 3D-printed dielectric helical waveguides.

Main Results:

• Metallic helical waveguides demonstrated single-mode, low-loss, and low-dispersion propagation over a broad bandwidth (0.2-1 THz).
• 3D-printed dielectric helical waveguides significantly extended the operational bandwidth compared to conventional dielectric tubes.
• Experimental and simulation results showed strong agreement, validating the waveguide performance.

Conclusions:

• Helical waveguide designs are effective for guiding Terahertz radiation.
• Both metallic and dielectric helical waveguides offer advantages in terms of loss, dispersion, and bandwidth.
• The flexibility of helical waveguides facilitates integration into compact Terahertz systems.