Theoretical Analysis of a Hyperbolic Metamaterial for Harvesting Visible and Infrared Light

摘要

This paper demonstrates visible, infrared light absorption and hyperbolic metamaterial harvesting in a multilayer absorber made of tungsten and SiO2. High absorption peaks were obtained between 0.4 mu m and 3 mu m for a uniform plane wave with normal incidence on the interface. The effective medium theory accurately predicted the absorption peak of the multilayer nanostructure. The magnetic and electric fields in the y = 0 plane are predicted at six different incident wavelengths (0.3 mu m, 0.6 mu m, 1 mu m, 2 mu m, 3 mu m, and 4 mu m) to describe the absorption mechanism. The efficient light harvesting can be explained by the slowlight mode and localized surface plasmon resonance. The dispersion relation of the effective medium can be described by a hyperbolic curve between 2 mu m and 4 mu m. Then, the current density distributions at 3 mu m and 4 mu m are given to explain the nature of the electric and magnetic resonances. Finally, the absorber characteristics are given for various geometric parameters. Absorbers with larger periodic unit cells had better absorption of the visible and infrared waveband. This artificial structure has great potential for many applications as thermal emitters and thermal absorbers.