Comprehensive study of terahertz metamaterial absorber by applying a hybrid approach on its circuit analogue

Here, we propose a hybrid approach to uniquely determine the elements of the circuit analogue of the terahertz metamaterial absorber that we previously reported. The proposed method is based on calculations, fitting, and physical mechanism of the absorption process interpreted by the model. In this work, the correlation between the model components and our designed absorber is comprehensively enlightened, and the dependence of the model elements to structural dimensions of the absorber is analyzed both qualitatively and quantitatively. By applying this approach on frequency selective surface (FSS) model, we are also able to interpret the polarization insensitivity of our designed absorber. The proposed model and approach is applicable for all metamaterial absorbers with any arbitrary FSS design. (C) 2015 Optical Society of America