Tunable multi-band terahertz absorber using a single-layer square graphene ring structure with T-shaped graphene...

Area of Science:

• Metamaterials
• Terahertz Technology
• Graphene

Background:

• Metamaterial absorbers (MAs) are crucial for various applications.
• Achieving tunable multi-band absorption with compact structures remains a challenge.

Purpose of the Study:

• To numerically demonstrate a tunable dual-band terahertz metamaterial absorber (MA).
• To explore the potential for multi-band absorption using graphene-based structures.

Main Methods:

• Utilizing a single-layer square graphene ring structure with T-shaped graphene strips.
• Periodically loading T-shaped graphene strips to modify resonant frequencies.
• Investigating the effect of geometric parameters and chemical potential of graphene.

Main Results:

• Achieved near-unity absorption at dual-band frequencies.
• Demonstrated tunability of absorption peaks by adjusting geometric parameters.
• Showcased frequency manipulation via graphene's chemical potential.
• Confirmed polarization-independent and incident-angle-insensitive properties.
• Extended the design to a tri-band absorber configuration.

Conclusions:

• The proposed graphene-based MA offers a promising platform for tunable multi-band absorption.
• The design's flexibility and performance make it suitable for optoelectronic devices.
• Further development could lead to absorbers with more absorption peaks for diverse applications.