Ultra-Wideband Terahertz Absorber Composite Dielectric and Vanadium Dioxide

With the constant advancement of terahertz (THz) technology, having absorptive metasurfaces capable of capturing terahertz energy is of great significance. In this study, we introduce an innovative four-layer dielectric-vanadium dioxide (VO2) -dielectric-VO2 device, capable of achieving ultra-wideband absorption with an efficiency exceeding 95% within the 3.58–9.9 THz range. A thorough investigation into the electric field distribution reveals the significant impact of dipole resonance on the absorption spectrum. The optimization of the process demonstrates that the proposed metasurface exhibits outstanding robustness to parameter variations, along with the capabilities of being polarization-insensitive and having stability to the incident angle. The device holds potential for applications in the fields of THz energy harvesting based on its outstanding performance and stability.