Ricerc@Sapienza

We numerically investigated the asymmetric spectral emissivity in the mid- to long-infrared range of
a metamaterial composed by subwavelength oriented air inclusions into a polar (SiC) matrix. The longitudinal
phononic resonance can be excited and tuned as a function of the inclusions content and
orientation, within the application limits of the effective medium homogenization technique. Furthermore,
our numerical results show that it is possible to enhance the emissivity in a given direction

We numerically investigated the peculiar spectral properties in the mid- to long-infrared range of a metamaterial
composed of silicon carbide subwavelength oriented wires, deposited onto a silicon substrate. We show how
anisotropic ellipsoids can be arranged, choosing both shape and orientation, so that the final resulting emissivity
could match the emissivity peaks of hazardous chemicals for different polarizations of the emitted light. As an
example, we design a metamaterial-based device that matches the emissivity lines of two explosives, such as XRD