Reconfigurable metamaterial terahertz filters based on graphene

A reconfigurable metamaterial terahertz filter based on graphene is presented and discussed. The device structure consists of periodic metallic rings with gaps, where graphene stripes are located. It is shown that the filter resonance frequency can easily be adjusted by varying the conductivity of graphene; this is practically implemented via changing the number of stacked graphene layers. Terahertz time domain spectroscopy measurements of the fabricated samples show that the resonance of the structure can be altered a 40% (i.e. from 0.2 THz to 0.12 THz).