High-efficiency Huygens' metasurface for terahertz wave manipulation

Area of Science:

• Metasurfaces
• Terahertz (THz) technology
• Wavefront manipulation

Background:

• Huygens' metasurfaces effectively modulate electromagnetic waves through impedance and admittance design.
• Transmissive Huygens' metasurfaces present challenges in the terahertz band.

Purpose of the Study:

• To propose and theoretically demonstrate a transmission-type Huygens' metasurface for terahertz waves.
• To achieve reflectionless phase modulation with simple geometric parameter control.

Main Methods:

• Design of a transmission-type Huygens' metasurface utilizing bilayer metallic patches.
• Theoretical demonstration and simulation of phase modulation capabilities.
• Application in designing a high-efficiency beam deflector for anomalous refraction.

Main Results:

• Achieved 2π phase coverage for linearly polarized terahertz waves.
• Demonstrated reflectionless phase modulation.
• Successfully designed a beam deflector with 19.8° anomalous refraction angle.
• Showcased simple phase control via a single geometric parameter.

Conclusions:

• The proposed metasurface offers a straightforward method for terahertz wave manipulation.
• Enables efficient terahertz devices for advanced wavefront control.
• Paves the way for practical terahertz applications.