Abstract
We present the design, numerical simulations and characterization of a dynamically tunable dual band metamaterial absorber that shows two distinct absorption peaks in terahertz (THz) regime. The designed absorber consists of a metal ground plane fixed on substrate and a movable metamaterial suspended above the ground plane. Through applying a bias voltage to adjust the height between the suspended elements and metal ground plane, we can switch absorber's state between absorption and reflection. Moreover, the designed absorber is polarization-insensitive and can be operated over a wide range of incidence angles owing to the high degree symmetry of designed structure.
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