Terahertz Wave Absorber For 6G Networks

Their high frequency makes them vulnerable to interference from electromagnetic noise, posing challenges for clear and secure communication; as 6G development progresses, innovations like this absorber will be instrumental in unlocking the full potential of next-generation wireless networks.

In collaboration with Nippon Denko Co., Ltd., researchers from the University of Tokyo have developed the world’s thinnest electromagnetic wave absorber for frequencies between 0.1 and 1 THz. This innovation expands the commercially viable terahertz spectrum, marking a crucial step toward practical 6G deployment.

Terahertz waves are expected to revolutionize wireless communication, offering speeds up to 240 gigabits per second—far surpassing 5G capabilities. However, minimizing interference is essential to ensure stable signals.

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Electromagnetic wave absorbers play a crucial role in this process by reducing unwanted wave reflections and noise. The newly developed absorber is composed of lambda-trititanium-pentoxide (λ-Ti3O5) coated with titanium dioxide (TiO2). This structure effectively dissipates interfering waves, ensuring clearer signals.

Ultra-Thin, Durable, and Eco-Friendly

At just 48 micrometers thick—half the width of a human hair—the absorber is highly adaptable for compact devices. Its titanium-based composition makes it not only cost-effective but also environmentally friendly. Unlike previous absorbers limited to frequencies below 0.3 THz, this breakthrough expands usability across a broader range, enhancing 5G and 6G applications.

Moreover, the material is resistant to heat, water, light, and organic solvents, making it suitable for outdoor and harsh environments. Potential applications include wireless communication, security sensing, and quality inspection via tomographic imaging.

“The higher frequency range above 0.3 THz remains largely unexplored, and we are eager to contribute to its development,” said Professor Shin-ichi Ohkoshi from the University of Tokyo. “Our goal is to advance this technology for practical use and help build a faster, eco-friendly wireless future.”