Ultrathin Terahertz-Wave Absorber Based on Inorganic Materials for 6G Wireless Communications.

Area of Science:

• Materials Science
• Electromagnetics
• Nanotechnology

Background:

• Terahertz (THz) waves are crucial for next-generation wireless communications, including 6G and autonomous driving.
• Effective electromagnetic-wave absorbers are needed for THz applications to ensure data security and prevent interference.

Purpose of the Study:

• To develop a high-performance THz wave absorber.
• To investigate a novel composite material for THz absorption applications.

Main Methods:

• Fabrication of a composite absorber using metallic λ-Ti3O5 and insulating TiO2 nanocrystals (λ-Ti3O5@TiO2).
• Characterization of the material's dielectric properties, including real (permittivity, ε') and imaginary (dielectric loss, ε″) parts, and tan(δ).
• Measurement of reflection loss for an ultrathin film of the composite material.

Main Results:

• The λ-Ti3O5@TiO2 composite exhibited strong THz wave absorption.
• High values for both real (ε') and imaginary (ε″) parts of the complex dielectric constant were observed.
• Significantly high tan(δ) values (0.50–0.76) were recorded between 0.1 and 1 THz.
• An ultrathin film (48 μm) achieved -28 dB reflection loss, corresponding to 99.8% absorption.
• The material demonstrated resistance to heat, light, water, and organic solvents.

Conclusions:

• A high-performance, ultrathin THz wave absorber was successfully developed.
• The developed material offers excellent absorption properties and environmental resistance.
• The cost-effective fabrication method supports diverse applications, including outdoor use in advanced wireless systems.