Fast decomposed method to devise broadband polarization-conversion metasurface.

Area of Science:

• Electromagnetics and Metamaterials
• Nanophotonics and Plasmonics

Background:

• Designing broadband, wide-angle, and high-efficiency polarization converters with simple geometries is a significant challenge in metasurface research.
• Existing methods for metasurface design can be computationally expensive and complex.

Purpose of the Study:

• To propose a simple and computationally inexpensive method for designing broadband polarization conversion metasurfaces.
• To achieve efficient conversion of linearly polarized waves into cross-polarized waves with a wide bandwidth and angle.

Main Methods:

• A cross-shaped metasurface configuration composed of two bars of different lengths was employed.
• The metasurface design was decomposed into two orthogonally polarized responses, calculated separately.
• A fitness function was defined to optimize the bandwidth of linear polarization conversion for broadband applications.

Main Results:

• The proposed method successfully designed a metasurface achieving a relative bandwidth of [Formula: see text] for linear to cross-polarization conversion.
• The designed metasurface demonstrated an average polarization conversion ratio exceeding [Formula: see text] over a broad frequency range (10.9–28.5 GHz).
• The method significantly reduces computational expense compared to traditional approaches.

Conclusions:

• The developed method offers a computationally efficient and straightforward approach for designing broadband polarization conversion metasurfaces.
• The technique is versatile and can be extended to more complex metasurface structures and configurations.
• This work contributes to the advancement of efficient polarization control devices for various electromagnetic applications.