Independently tunable quint band electromagnetically induced transparency windows for multifunctional terahertz device

Independent tunability of electromagnetically induced transparent (EIT) multi-channels is highly desirable for multi-functional THz devices like multi-channel selective switching, multi-wavelength biosensing, filters, and slow light. We report independently tunable, graphene-based quint-EIT THz metasurface, made of closed kite-shaped square ring resonators (CKSSRR). In our simulations, we consider three concentric CKSSRR, which offer quint band EIT-like transmission features. The metastructure is polarization insensitive for THz frequencies. We observe that the number of EIT bands can be increased by adding outer kite rings, which can further extend the spectral range of operation of the device. We also propose an analytical model for ‘ n ’ operational EIT spectral bands. The EIT-like behavior is well supported by the distribution of induced current and group delays. The proposed novel method can open new doors to design multi-purpose terahertz (THz) meta-devices with a large number of EIT bands.