Coaxial waveguide mode reconstruction and analysis with THz digital holography

Area of Science:

• Optics and Photonics
• Electromagnetics
• Materials Science

Background:

• Waveguides are crucial components in guiding electromagnetic waves.
• Characterizing propagation modes is essential for optimizing waveguide performance.
• Terahertz (THz) technology offers unique properties for sensing and imaging.

Purpose of the Study:

• To investigate waveguide properties using Terahertz (THz) digital holography.
• To measure and restore the propagation modes within a metallic coaxial waveguide.
• To demonstrate the potential of THz digital holography for waveguide characterization.

Main Methods:

• Utilized a THz digital holographic imaging system.
• Measured propagation modes in a metallic coaxial waveguide.
• Applied the inverse Fresnel diffraction algorithm to restore mode patterns.

Main Results:

• Identified the THz propagation mode as a combination of TE₁₁, TE₁₂, TM₁₁, and TM₁₂ modes.
• Experimental results showed strong agreement with simulation data.
• Demonstrated the effectiveness of THz digital holography for mode analysis.

Conclusions:

• THz digital holography is a powerful platform for characterizing waveguide modes.
• The findings provide valuable insights for the design of THz waveguides.
• This technique has significant potential for future applications in THz technology.