Optical transparent infrared high absorption metamaterial absorbers

Abstract

In this work, an optical transparent infrared high absorption metamaterial absorber is proposed based on indium tin oxide (ITO) substrate. Due to the fact that ITO holds high reflectivity property in infrared region while transparent in optical region, ITO can be used in the application of Surface Plasmon Polaritons. In this design, three kinds of infrared metamaterial absorbers were proposed. All of them can achieve high absorption at 10.6 μm while remaining transparent in visible region. LC equivalent circuit model was served as design foundation. The infrared absorption efficiency was numerically calculated and the mechanism analysis is given in the paper. The simulation results show that all three structures can achieve high absorption efficiency at 10.6 μm under TE/TM polarization. The absorption remains high when the incident angle is less than 70°. Experimental results exhibit good accordance with simulation.