Terahertz Ultra-broadband Perfect Absorption and Switching Based on Brewster Metasurfaces

Strategic Insights -

Scientists at North China Electric Power University have made a groundbreaking discovery in the field of applied physics, proposing a novel metasurface that can exhibit perfect broadband absorption characteristics in the terahertz (THz) band. This breakthrough has significant implications for the development of THz stealth and switching devices. The researchers' innovative design utilizes periodically tilted vanadium dioxide films arranged in a silicon dioxide substrate, allowing for ultra-broadband absorption capabilities that cover the conventional full THz band and extend to higher frequencies.

Key Takeaways:

  • The proposed metasurface exhibits perfect broadband absorption characteristics in the THz band, ranging from 2 to 22.5 THz, making it highly effective for THz stealth and switching devices.
  • The metasurface's absorption performance can be controlled dynamically by adjusting the structural parameters, enabling applications in THz switching devices.
  • The research demonstrates the potential of Brewster metasurfaces for ultra-broadband high absorption, with the proposed metasurface achieving perfect broadband absorption and transmission switching capabilities.
  • The study highlights the significance of the anomalous Brewster effect in the development of metasurfaces for THz applications.
  • The funding for this research was provided by the National Natural Science Foundation of China, the Fundamental Research Funds for the Central Universities, the Natural Science Foundation of Tianjin, and the Open Subject of Hebei Key Laboratory of Advanced Laser Technology and Equipment.
  • The researchers have designed a gradient Brewster metasurface that exhibits dynamical controllability toward THz waves with nearly omnidirectional wavefronts.

Statistics:

  • The proposed metasurface achieves perfect broadband absorption ranging from 2 to 22.5 THz.
  • The ultra-broadband absorption capabilities cover the conventional full THz band and extend to higher frequencies.
  • The metasurface's absorption performance is controlled dynamically by adjusting the structural parameters.
  • The research has been peer-reviewed and published in the Journal of Applied Physics, 2025; 138(9).

Sources:

  • NewsRx. New Applied Physics Study Findings Have Been Reported by Investigators at North China Electric Power University (Terahertz Ultra-broadband Perfect Absorption and Absorption-to-transparency Switching Based On Brewster Metasurfaces). Journal of Engineering. October 20, 2025; p 1501.
  • Terahertz Ultra-broadband Perfect Absorption and Absorption-to-transparency Switching Based On Brewster Metasurfaces. Journal of Applied Physics, 2025;138(9).