Achieving dual-band absorption and electromagnetically induced transparency in VO2 metamaterials

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 degrees or 30 degrees in two modes. The proposed design may enable advanced applications in the fields of modulator and filter.