A new type of terahertz switchable metamaterial is proposed with dual functions. By introducing vanadium dioxide possessing insulator-to-metal transition, the designed metamaterial can be switched from a dual-band absorber to an analog of electromagnetically induced transparency. When vanadium dioxide is in the conducting state, the designed structure works as a dual-band absorber with 100% absorptance at 1.02 THz and 1.71 THz. When vanadium dioxide is in the insulating state, the designed structure works as an analog of electromagnetically induced transparency. The performances of bifunctionality are omnidirectional and efficient in the incident angle range of 60° or 30° in two modes. The proposed design may enable advanced applications in the fields of modulator and filter.

提出了一种具有双重功能的新型太赫兹可切换超材料。通过引入具有绝缘体到金属过渡的二氧化钒，设计的超材料可以从双波段吸收器转换为电磁感应透明的模拟。当二氧化钒处于导电状态时，设计的结构作为双波段吸收器在 1.02 THz 和 1.71 THz 处具有 100% 吸收率。当二氧化钒处于绝缘状态时，设计的结构就像电磁感应透明的模拟物。双功能性在60°或30°两种模式的入射角范围内具有全方位和高效的性能。所提出的设计可以实现调制器和滤波器领域的高级应用。