US Patent 8995055 Angular and spectral selective absorber in ultrathin metamaterials

An angular and spectral selective absorber in ultrathin metamaterials is an absorber having an absorption wavelength, λ. Embodiments of the invention include at least one primary layer having a thickness, d, and a relative permittivity of epsilon-near-zero, ε. At least one reflective secondary layer is associated with the primary layer. The association is by bonding.