부산대학교 도서관

We designed a metamaterial solar absorber by combining impedance matching theory and equivalent circuit model. This design model can improve design efficiency and reduce calculations relative to conventional design methods. The absorption bandwidth of the metamaterial solar absorber is 2550 nm at an absorption rate greater than 90%, which can cover both visible and near-infrared wavelengths (300 − 2850 nm). The absorption over the whole wavelength range (300 − 3000 nm) (weighted directly around the sun by solar AM 1.5) is more than 90%. In addition, the proposed absorber has polarization-insensitive and wide-angle absorption characteristics, and the average absorption exceeds 88% when the wide-incidence angle is up to 60° for both transverse electric mode and transverse magnetic mode. The perfect absorption characteristics of the absorber are mainly attributed to the local surface plasmon resonance, cavity resonance and the synergistic interaction with each other. We proposed design has high broadband absorption and great potential for solar thermal energy harvesting, fire detection, and thermoelectric applications.