Abstract
Metallic perfect absorbers have been widely studied due to the potential applications. Nevertheless, it is rather difficult to quantitatively adjust the absorption properties. Here, we propose a new multi-band absorber platform, which is with the capability to be quantitatively manipulated the resonant frequency and intensity. In this work, a metasurface consisting of silicon resonators is used to act as the optical coupling component, which can produce strong electromagnetic resonances. The maximal absorptance ∼100% is achieved in the four-band absorber. More importantly, the operation wavelengths show linear relationship to the resonator's height. Furthermore, the absorption efficiencies can be quantitatively controlled by the polarization angle of the incident light. These findings pave a new way for the precise-design absorbers and hold applications in artificially adjustable optoelectronic devices.
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