  Stealthy hyperuniform heterostructures are a novel type of metamaterial with
the potential for optical image processing at angles away from normal
incidence. These metamaterials show analogous properties to photonic crystals
while circumventing the spatial anisotropy often hindering the latter's use. In
this paper, we have successfully designed, fabricated, and characterized a
hole-based stealthy hyperuniform structure on a quantum cascade layer
substrate. The infrared spectral data reveal a sizable gap-midgap ratio of 9.8%
for a photonic band gap around $12.0 ~\mu m$ in the form of an enhanced
reflection region for increasing incidence angles. The stealthy hyperuniform
metamaterial also showed spatial isotropy by its unchanging reflection spectrum
for all in-plane rotational angle measurements.
