High-efficiency reflective terahertz cross-polarization converter with broadband and wide-angle response

Area of Science:

• Physics
• Electrical Engineering
• Materials Science

Background:

• Metasurfaces offer unique electromagnetic properties.
• Cross-polarization conversion is crucial for advanced terahertz applications.
• Existing terahertz converters face limitations in bandwidth and angular stability.

Purpose of the Study:

• To design, fabricate, and assess a broadband terahertz metasurface for cross-polarization conversion.
• To achieve high polarization conversion efficiency and ratio over a wide frequency range.
• To ensure angular stability for practical terahertz applications.

Main Methods:

• Design of a metasurface composed of nested double-split rings.
• Electromagnetic simulations to predict performance.
• Fabrication of the metasurface with 50x70 arrays.
• Experimental assessment of the fabricated metasurface.

Main Results:

• Achieved >99% polarization conversion efficiency from 90-140 GHz.
• Maintained >90% polarization conversion ratio (PCR) up to 50° incidence angle.
• Experimental results closely matched simulation predictions.

Conclusions:

• The developed terahertz metasurface exhibits excellent broadband cross-polarization conversion.
• The metasurface's inherent insensitivity to incidence angle enhances its practical utility.
• This work significantly advances the performance of terahertz cross-polarization converters.