Perfect absorbers for electromagnetic wave, based on metamaterials

摘要: Metamaterials (MMs), which are not existing in nature, but artificially-engineered materials for controlling electromagnetic wave. MMs have attracted more and research attentions, since they shown greatly novel properties such as left-handed behavior, negative refractive index, classical analog of electromagnetically-induced transparency, extraordinary transmission. Among MMs, MM perfect absorbers (MMPAs), useful to enhance the efficiency capturing solar energy applied various application areas, been rapidly developed. In general, structure MMPAs is very simple, consist three layers: patterned conductor layer, used minimizing reflection by impedance matching, dielectric layer continuous blocking addition, unit-cell size general only 1/3−1/5 working wavelength incident Nevertheless, problems absorption at specific frequency, narrow band, polarization sensitivity so on. this review paper, introduction recent researches field operating different frequency ranges presented. Moreover, on improved discussed, comprise multi-band, broadband, tunable, polarization-insensitive, wide-incident-angle MMPAs. The perspectives future works further investigations real applications also