Abstract
The absorption characteristics of a photoexcited tunable perfect metamaterial absorber (PMA) at terahertz (THz) frequencies are analyzed based on the split-ring resonators (SRRs)-dielectrics-metallic structure, which are caused by different thicknesses and dielectric constants of polyimide, cell sizes and widths of SRRs, and lengths and conductivities of the photosensitive silicon. The results manifest that the resonance frequency and absorption strength of the designed PMA can be tuned by adjusting the shape, size, thickness, and properties of the metallic structure and dielectric spacer. The simple design and wide frequency tuning range of the PMA can find potential applications in terahertz detectors, filters, switchers, and absorbers.
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