  We demonstrate a classical analogue of electromagnetically induced
transparency (EIT) in a highly flexible planar terahertz metamaterial (MM)
comprised of three-gap split ring resonators. The keys to achieve EIT in this
system are the frequency detuning and hybridization processes between two
bright modes coexisting in the same unit cell as opposed to bright-dark modes.
We present experimental verification of two-bright mode coupling for a
terahertz EIT-MM in the context of numerical results and theoretical analysis
based on a coupled Lorentz oscillator model. In addition, a hybrid variation of
the EIT-MM is proposed and implemented numerically in order to dynamically tune
the EIT window by incorporating photosensitive silicon pads in the split gap
region of the resonators. As a result, this hybrid MM enables the potential
active optical control of a transition from the on-state (EIT mode) to the
off-state (dipole mode).
