Liquid Crystal Tunable Metamaterial Perfect Absorber

摘要

We present experimental demonstration of electronically tunable metamaterialperfect absorbers in the terahertz regime. By incorporation of active liquidcrystal into strategic locations within the metamaterial unit cell we are ableto modify the absorption by 30 percent at 2.62 THz, as well as tune theresonant absorption over 4 percent in bandwidth. Numerical full-wavesimulations match well to experiments and clarify the underlying mechanism,i.e. a simultaneous tuning of both the electric and magnetic response thatallows for the preservation of the resonant absorption. These results show thatthe fundamental light interactions of surfaces can be dynamically controlled byall-electronic means and provide a path forward for realization of novelapplications.