Light absorption abilities of hypercrystals

Abstract

Here, we employ the theory of electromagnetic waves in non-magnetic multilayer hypercrystals to determine their spectra and derive dispersion relations for ordinary and extraordinary waves. We demonstrate that the reflection of a hypercrystal vanishes, while the absorption increases, if its wave impedance is matched to that of the surrounding medium. We study the absorption properties of hypercrystals focusing on absorption dependence on thicknesses of availab le layers. We reveal that the peak values of absorption increase for thicker spacer layer, while the wavelength at the peak is red-shifted. Dependence on the filling fraction of metal is shown to be strongly dependent on the dispersive properties of hypercrystals exhibiting lower absorption for greater filling fractions, while the absorption peak value and absorption bandwidth can be tailored with number of layers. This research might be useful for maximsing absorption to achieve a broadband perfect absorber on the hypercrystal platform.