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A tunable terahertz (THz) bandstop filter based on electrostatically actuated microelectromechanical systems (MEMS) reconfigurable metamaterials is presented. The central part of the filter is a periodic array structure, and each unit cell consists of a movable bar and a fixed inverted trapezoidal ring. When direct current (DC) voltage is applied to actuate the electrostatic comb actuators symmetrically...
A separately tunable terahertz (THz) two-peak absorber based on graphene is presented. From bottom to top, the absorber contains four layers, i.e., gold reflector, graphene patch array, polyimide and metal split-ring resonator (SRR) array layer. The controlling voltage is applied between the reflector and two separated surface electrodes to tune the Fermi level of graphene. As a result, these two...
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