Fig. 1. Photos of metamaterial absorber as well as simulated and experimental results. (a) Optical micrograph of metamaterial absorber; (b) metamaterial absorber sample; (c) simulated and experimental absorption spectra; (d) absorption characteristic versus incident angle

Fig. 2. Results of interference theory and schematic. (a) Schematic of metamaterial absorber; (b) schematic of interference theory; (c) absorption spectrum calculated according to interference theory, simulated spectral line, and amplitudes of direct reflection and indirect reflection; (d) phases of direct reflection and indirect reflection

Fig. 3. Influences of real part of permittivity on absorption characteristics. (a)Influence of real part of permittivity on amplitude difference between direct reflection and indirect reflection; (b) influence of real part of permittivity on phase difference between direct reflection and indirect reflection

Fig. 4. Absorption of Jerusalem cross obtained by interference theory and transmission line theory ( inset: schematic of transmission line theory)

Fig. 5. Absorption characteristics obtained by transmission line theory at different lengths of short-side. (a) Absorption lines at different lengths of short-side; (b) amplitudes of direct reflection and indirect reflection at different lengths of short-side; (c) phases of direct reflection and indirect reflection at different lengths of short-side