Three-dimensional metamaterial for reconfigurable multi-band electromagnetically induced transparency based on VO2

Conventional 2D planar metamaterials struggle to achieve multi-band electromagnetically induced transparency (EIT) effects due to structural constraints. This paper proposes what we believe to be a novel three-dimensional (3D) metamaterial consisting of a vertical split-ring resonator with vanadium dioxide (VO2) islands at the openings. Based on VO2's reversible phase transition capabilities, the designed metamaterial has excellent reconfigurability for multi-band EIT effects. When the surface temperature is at room temperature, VO2 exhibits an insulating state. The near-field coupling between bright and dark modes leads to a triple-band EIT effect at 1.72, 1.82, and 1.91 THz, characterized by multi-band, low-loss, and narrowband filtering. In contrast, when the temperature exceeds 68 degrees C, VO2 transitions to its metallic state, resulting in a single transmission window with favorable slow light characteristics. Compared to traditional EIT metamaterials, our work realizes multi-band modulation and switchable operating modes, enhancing flexibility and adaptability. The excellent performance indicates its suitability for various applications, including multi-channel sensors, switchable absorptions, enhancing coupling and slow light devices, etc. (c) 2024 Optica Publishing Group. All rights, including for text and data mining (TDM), Artificial Intelligence (AI) training, and similar technologies, are reserved.