Abstract

A dynamically tunable dual-band plasmon-induced transparency metamaterial structure based on a vanadium dioxide ring resonator is proposed in this work. Two discrete transparent windows are excited in the terahertz spectrum and analyzed with a multipole expansion method for this system. A broader transparent window is formed by the destructive interference of the electric dipole and magnetic dipole modes, while the other is induced by the excitation of a pseudo-anapole mode, which originates from the coupling of the higher order multipoles of magnetic dipole and electric quadrupole. Based on this proposed system, the sensing sensitivity can reach 160 and 37 GHz/RIU with group delays of 3.4 and 37.9 ps at these two transparent windows. The proposed metamaterial device provides a new pathway for the design of the PIT effect for sensing, optical storage, and new terahertz functional devices.

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