Highly Efficient Broadband Light Absorber Based on Nonuniform Hyperbolic Metamaterial Film

Figure 2

(Color online) (a) the geometry of the problem: the wire-medium slab with the thickness is placed on the perfectly reflecting substrate. The components , , and of the effective permittivity tensor depend on the orientation of the principal axes of the metamaterial, i.e., on the angle between the wires and the normal to the air-MM interface. In the slab of homogeneous metamaterial is fixed; however, we also consider the case of spatially changing orientation of the medium optical axis (see Figures 5–7). (b) Sketch of resonance cones orientation in inhomogeneous hyperbolic medium. The wave vector of propagating radiation is located inside the resonance cone.

(a)

(b)