Multi-functional coding metasurface for dual-band independent electromagnetic wave control

Area of Science:

• Electromagnetics
• Materials Science
• Metasurface Technology

Background:

• Metasurfaces offer powerful electromagnetic wave manipulation capabilities, enhancing information capacity.
• Existing metasurfaces typically control electromagnetic functions using a single property like polarization or frequency.
• Independent control over multiple electromagnetic wave properties remains a challenge.

Purpose of the Study:

• To propose a coding scheme for designing a broadband, high-efficiency multi-functional metasurface.
• To achieve independent control of electromagnetic wave functions by both frequency and polarization.
• To demonstrate a single metasurface capable of diverse functionalities across different frequency bands.

Main Methods:

• Design of anisotropic coding particles for independent phase functions and polarization-selectivity.
• Optimization of meta-atoms for specific phase responses across X-band and Ku-band.
• Configuration of a metasurface as an isotropic lens and an anisotropic beam deflector.

Main Results:

• Demonstrated independent phase control based on frequency and polarization.
• Achieved 2-bit phase response insensitive to polarization in the X-band.
• Showcased 1-bit phase shift sensitive to polarization in the Ku-band, enabling polarization-conversion.
• Experimental results validated simulated performance for dual-band functionalities.

Conclusions:

• The proposed coding scheme enables independent frequency and polarization control of electromagnetic waves.
• The developed multi-functional metasurface integrates diverse functionalities into a single device.
• This approach offers a flexible and robust method for advanced electromagnetic wave manipulation.