Multiple interference theoretical model for graphene metamaterial-based tunable broadband terahertz linear...

Area of Science:

• Optics and Photonics
• Materials Science
• Metamaterials

Background:

• Terahertz (THz) polarization converters are crucial for sensing, imaging, and communication.
• Existing THz converters often exhibit low efficiency, narrow bandwidth, and poor polarization purity.
• A lack of theoretical models hinders the design and optimization of THz polarization converters.

Purpose of the Study:

• To design and optimize a tunable broadband THz linear polarization converter.
• To address limitations of existing THz polarization devices through a novel theoretical model.
• To enable high-quality manipulation of THz radiation polarization.

Main Methods:

• Utilized multiple interference theory for the design and optimization process.
• Employed graphene metamaterials as the core component of the polarization converter.
• Investigated the tunability of the polarization conversion band by adjusting graphene chemical potential.

Main Results:

• Achieved a polarization conversion ratio (PCR) over 0.97.
• Demonstrated a broad polarization conversion band of 1.25 THz with low ellipticity.
• Showcased active tunability of the conversion band and insensitivity to incident angles up to 50°.

Conclusions:

• The developed graphene metamaterial-based converter offers high performance for THz polarization manipulation.
• The study provides an optimal design for tunable broadband THz linear polarization converters.
• A theoretical model for the design and optimization of tunable THz polarization converters is established.